{"product_id":"hobbywing-seaking-120a-v4-brushless-rc-boat-esc","title":"Hobbywing SEAKING 120A V4 2-6S Waterproof Brushless Marine ESC","description":"\u003cstyle\u003e\n.cnhl-esc-content {\n  line-height: 1.7;\n  color: #222;\n}\n\n.cnhl-esc-content h2 {\n  font-size:18px;\n  font-weight:700;\n  margin:24px 0 10px;\n  color:#000;\n  border-bottom:1px solid #eee;\n  padding-bottom:6px;\n}\n\n.cnhl-esc-content h3 {\n  font-size:15px;\n  font-weight:bold;\n  margin:14px 0 8px;\n  color:#000;\n}\n\n.cnhl-esc-table-wrap {\n  width:100%;\n  overflow-x:auto;\n  -webkit-overflow-scrolling:touch;\n  margin:14px 0 20px;\n}\n\n.cnhl-esc-table {\n  width:100%;\n  min-width:620px;\n  border-collapse:collapse;\n  font-size:14px;\n  line-height:1.5;\n}\n\n.cnhl-esc-table th,\n.cnhl-esc-table td {\n  padding:10px 12px;\n  border:1px solid #ddd;\n  text-align:left;\n  vertical-align:top;\n}\n\n.cnhl-esc-table th {\n  width:34%;\n  background:#E60073;\n  color:#fff;\n  font-weight:700;\n}\n\n.cnhl-esc-table td {\n  background:#f2f2f2;\n}\n\n.cnhl-fit-box {\n  background:#f7f7f7;\n  padding:14px 16px;\n  margin:16px 0;\n  border-left:4px solid #E60073;\n  font-size:14px;\n  line-height:1.65;\n}\n\n.cnhl-img {\n  margin:20px 0;\n  text-align:left;\n}\n\n.cnhl-img img {\n  width:auto;\n  height:auto;\n  max-width:100%;\n  display:block;\n}\n\n.cnhl-esc-link {\n  color:#E60073;\n  text-decoration:underline;\n}\n\u003c\/style\u003e\n\u003cdiv style=\"font-family: Arial,Helvetica,sans-serif; color: #333; font-size: 15px; line-height: 1.75;\"\u003e\n\u003cp style=\"margin: 0 0 14px;\"\u003eThe \u003cstrong\u003eHobbywing SEAKING 120A V4 Brushless Marine ESC\u003c\/strong\u003e is a high-current, water-cooled electronic speed controller designed for RC boats operating on 2S to 6S LiPo batteries. With 120A continuous current capacity, a 500A peak rating and an IP67 waterproof design, it provides the voltage flexibility and power handling required for demanding brushless marine propulsion systems.\u003c\/p\u003e\n\u003cp style=\"margin: 0 0 16px;\"\u003eAs the highest-current model in Hobbywing's standard SeaKing 30A–120A V4 range, the \u003cstrong\u003eSeaKing 120A V4 ESC\u003c\/strong\u003e combines 6S compatibility with an adjustable 8A switch-mode BEC, capacitor overheating protection, water cooling and configurable motor-control functions. Its slimmer V4 housing, AUX channel adjustment and optional HW LINK performance monitoring make it a practical option for RC boat builders upgrading to higher-voltage or higher-load brushless setups.\u003c\/p\u003e\n\u003cdiv style=\"background: #fff7fb; border-left: 4px solid #E60073; padding: 14px 16px; margin: 18px 0;\"\u003e\n\u003cstrong style=\"color: #111;\"\u003eQuick Fit Check\u003c\/strong\u003e\n\u003cul style=\"margin: 8px 0 0; padding-left: 20px;\"\u003e\n\u003cli\u003e\n\u003cstrong\u003eApplication:\u003c\/strong\u003e Brushless RC boats up to 100cm in length.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBattery:\u003c\/strong\u003e 2S–6S LiPo (7.4V–22.2V nominal).\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMotor:\u003c\/strong\u003e Single compatible sensorless brushless marine motor.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCurrent Rating:\u003c\/strong\u003e 120A continuous \/ 500A peak.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBEC:\u003c\/strong\u003e 8A switch-mode, adjustable 6V \/ 7.4V \/ 8.4V.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWaterproof:\u003c\/strong\u003e IP67 with integrated water cooling.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMotor Connectors:\u003c\/strong\u003e 4.0mm gold female bullet connectors.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBattery Connector:\u003c\/strong\u003e Not preinstalled; soldering required.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp style=\"font-size: 13px; line-height: 1.65; margin: 9px 0 0; color: #666;\"\u003eConfirm motor voltage rating, operating current, propeller load, battery discharge capability, cooling performance and available installation space before use. The recommended boat length is a manufacturer application guideline rather than a guaranteed fitment limit.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003ch2 style=\"font-size: 20px; font-weight: bold; color: #111; margin: 30px 0 12px; border-bottom: 1px solid #eee; padding-bottom: 8px;\"\u003eHobbywing SEAKING 120A V4 Specifications\u003c\/h2\u003e\n\u003ctable style=\"width: 100%; border-collapse: separate; border-spacing: 0 8px!important; font-size: 14px; line-height: 1.5;\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd style=\"width: 39%; background: #E60073; color: #fff; padding: 10px 12px; font-weight: bold;\"\u003eBrand \/ Series\u003c\/td\u003e\n\u003ctd style=\"background: #f2f2f2; padding: 10px 12px;\"\u003eHobbywing SEAKING V4\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"background: #E60073; color: #fff; padding: 10px 12px; font-weight: bold;\"\u003eModel\u003c\/td\u003e\n\u003ctd style=\"background: #f2f2f2; padding: 10px 12px;\"\u003eSEAKING 120A V4\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"background: #E60073; color: #fff; padding: 10px 12px; font-weight: bold;\"\u003eProduct Number \/ SKU\u003c\/td\u003e\n\u003ctd style=\"background: #f2f2f2; padding: 10px 12px;\"\u003e30302363\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"background: #E60073; color: #fff; padding: 10px 12px; font-weight: bold;\"\u003eESC Type\u003c\/td\u003e\n\u003ctd style=\"background: #f2f2f2; padding: 10px 12px;\"\u003eBrushless \/ Sensorless \/ Marine ESC\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"background: #E60073; color: #fff; padding: 10px 12px; font-weight: bold;\"\u003eContinuous \/ Peak Current\u003c\/td\u003e\n\u003ctd style=\"background: #f2f2f2; padding: 10px 12px;\"\u003e120A \/ 500A\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"background: #E60073; color: #fff; padding: 10px 12px; font-weight: bold;\"\u003eInput Voltage\u003c\/td\u003e\n\u003ctd style=\"background: #f2f2f2; padding: 10px 12px;\"\u003e2–6S LiPo (7.4–22.2V nominal)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"background: #E60073; color: #fff; padding: 10px 12px; font-weight: bold;\"\u003eBEC Output\u003c\/td\u003e\n\u003ctd style=\"background: #f2f2f2; padding: 10px 12px;\"\u003eSwitch-mode, 6V \/ 7.4V \/ 8.4V adjustable, 8A rated\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"background: #E60073; color: #fff; padding: 10px 12px; font-weight: bold;\"\u003eWaterproof Rating\u003c\/td\u003e\n\u003ctd style=\"background: #f2f2f2; padding: 10px 12px;\"\u003eIP67\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"background: #E60073; color: #fff; padding: 10px 12px; font-weight: bold;\"\u003eCooling System\u003c\/td\u003e\n\u003ctd style=\"background: #f2f2f2; padding: 10px 12px;\"\u003eIntegrated water cooling\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"background: #E60073; color: #fff; padding: 10px 12px; font-weight: bold;\"\u003eCooling Pipe Diameter\u003c\/td\u003e\n\u003ctd style=\"background: #f2f2f2; padding: 10px 12px;\"\u003e3.0mm inner \/ 5.5mm outer\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"background: #E60073; color: #fff; padding: 10px 12px; font-weight: bold;\"\u003eDimensions (L × W × H)\u003c\/td\u003e\n\u003ctd style=\"background: #f2f2f2; padding: 10px 12px;\"\u003e64.7 × 36.3 × 22.5mm (excluding water-cooling pipe)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"background: #E60073; color: #fff; padding: 10px 12px; font-weight: bold;\"\u003eWeight\u003c\/td\u003e\n\u003ctd style=\"background: #f2f2f2; padding: 10px 12px;\"\u003e123.5g (including wires and output connectors)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"background: #E60073; color: #fff; padding: 10px 12px; font-weight: bold;\"\u003eBattery Input Wires\u003c\/td\u003e\n\u003ctd style=\"background: #f2f2f2; padding: 10px 12px;\"\u003e12AWG red × 150mm \/ 12AWG black × 150mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"background: #E60073; color: #fff; padding: 10px 12px; font-weight: bold;\"\u003eMotor Output Wires\u003c\/td\u003e\n\u003ctd style=\"background: #f2f2f2; padding: 10px 12px;\"\u003e3 × 12AWG black wires, 100mm each\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"background: #E60073; color: #fff; padding: 10px 12px; font-weight: bold;\"\u003eBattery Input Connector\u003c\/td\u003e\n\u003ctd style=\"background: #f2f2f2; padding: 10px 12px;\"\u003eNone (connector installation required)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"background: #E60073; color: #fff; padding: 10px 12px; font-weight: bold;\"\u003eMotor Output Connectors\u003c\/td\u003e\n\u003ctd style=\"background: #f2f2f2; padding: 10px 12px;\"\u003e4.0mm gold female bullet connectors\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"background: #E60073; color: #fff; padding: 10px 12px; font-weight: bold;\"\u003eFreewheeling\u003c\/td\u003e\n\u003ctd style=\"background: #f2f2f2; padding: 10px 12px;\"\u003eSupported, enable \/ disable selectable\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"background: #E60073; color: #fff; padding: 10px 12px; font-weight: bold;\"\u003eCapacitor Overheating Protection\u003c\/td\u003e\n\u003ctd style=\"background: #f2f2f2; padding: 10px 12px;\"\u003eSupported\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"background: #E60073; color: #fff; padding: 10px 12px; font-weight: bold;\"\u003eESC Programming\u003c\/td\u003e\n\u003ctd style=\"background: #f2f2f2; padding: 10px 12px;\"\u003eLED Program Box, LCD G2, LCD Pro, OTA Programmer\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"background: #E60073; color: #fff; padding: 10px 12px; font-weight: bold;\"\u003eProgramming Connection\u003c\/td\u003e\n\u003ctd style=\"background: #f2f2f2; padding: 10px 12px;\"\u003eThrottle signal cable + yellow signal cable\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"background: #E60073; color: #fff; padding: 10px 12px; font-weight: bold;\"\u003ePeak Value Recording\u003c\/td\u003e\n\u003ctd style=\"background: #f2f2f2; padding: 10px 12px;\"\u003eSupported\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"background: #E60073; color: #fff; padding: 10px 12px; font-weight: bold;\"\u003eReal-Time Data Monitoring\u003c\/td\u003e\n\u003ctd style=\"background: #f2f2f2; padding: 10px 12px;\"\u003eSupported with compatible external OTA module\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"background: #E60073; color: #fff; padding: 10px 12px; font-weight: bold;\"\u003eHistorical Data Graphs\u003c\/td\u003e\n\u003ctd style=\"background: #f2f2f2; padding: 10px 12px;\"\u003eExternal OTA supported; independent built-in historical graph recording not supported\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"background: #E60073; color: #fff; padding: 10px 12px; font-weight: bold;\"\u003eFirmware Upgrade\u003c\/td\u003e\n\u003ctd style=\"background: #f2f2f2; padding: 10px 12px;\"\u003eSupported with compatible programming hardware\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"background: #E60073; color: #fff; padding: 10px 12px; font-weight: bold;\"\u003eRecommended Boat Length\u003c\/td\u003e\n\u003ctd style=\"background: #f2f2f2; padding: 10px 12px;\"\u003e≤100cm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003ch2 style=\"font-size: 20px; font-weight: bold; color: #111; margin: 30px 0 12px; border-bottom: 1px solid #eee; padding-bottom: 8px;\"\u003eKey Features of the SEAKING 120A V4\u003c\/h2\u003e\n\u003ch3 style=\"font-size: 17px; font-weight: bold; color: #111; margin: 20px 0 8px;\"\u003e120A Continuous Current and 6S LiPo Compatibility\u003c\/h3\u003e\n\u003cp style=\"margin: 0 0 14px;\"\u003eThe defining advantage of the SeaKing 120A V4 is its combination of \u003cstrong\u003e120A continuous current capacity and support for up to 6S LiPo batteries\u003c\/strong\u003e. While the SeaKing 90A V4 reaches its maximum supported voltage at 4S, the 120A model extends the operating range to 5S and 6S power systems.\u003c\/p\u003e\n\u003cp style=\"margin: 0 0 14px;\"\u003eA 6S LiPo battery provides a nominal voltage of 22.2V, compared with 14.8V for 4S. For a properly matched motor and propeller, higher operating voltage can provide greater available electrical power and allow different motor-speed and current configurations.\u003c\/p\u003e\n\u003cp style=\"margin: 0 0 14px;\"\u003eThe ESC's 500A peak rating provides short-duration current-handling capability, but it should not be interpreted as a sustainable operating limit. Continuous operation must remain within the 120A rating and suitable thermal conditions.\u003c\/p\u003e\n\u003cp style=\"margin: 0 0 14px;\"\u003eFor high-performance RC boats, the actual electrical load depends on motor KV, propeller diameter, propeller pitch, hull resistance and operating conditions. Increasing battery voltage or propeller load without checking motor current can overload even a high-current ESC.\u003c\/p\u003e\n\u003ch3 style=\"font-size: 17px; font-weight: bold; color: #111; margin: 22px 0 8px;\"\u003eIP67 Waterproof Design with Integrated Water Cooling\u003c\/h3\u003e\n\u003cp style=\"margin: 0 0 14px;\"\u003eThe SeaKing 120A V4 features an IP67-rated waterproof and dustproof construction designed for the demanding environment of RC marine operation. Its protected housing helps shield the internal electronics against water exposure under the manufacturer's specified conditions.\u003c\/p\u003e\n\u003cp style=\"margin: 0 0 14px;\"\u003eThe integrated water-cooling system is particularly important for a 120A-class ESC. It helps transfer heat away from the electronic components during operation, supporting temperature management under sustained motor load.\u003c\/p\u003e\n\u003cp style=\"margin: 0 0 14px;\"\u003eThe cooling pipe connections have a \u003cstrong\u003e3.0mm inner diameter and 5.5mm outer diameter\u003c\/strong\u003e. Install appropriately sized tubing, secure the connections and verify that cooling water circulates correctly before applying significant throttle.\u003c\/p\u003e\n\u003cp style=\"margin: 0 0 14px;\"\u003eAlthough the ESC housing is waterproof, electrical connectors and solder joints still require attention. After operation, inspect and dry exposed plugs to reduce corrosion risk. The IP67 protection rating does not eliminate the need for maintenance, and protection may decrease with wear or damage.\u003c\/p\u003e\n\u003cdiv class=\"cnhl-img\"\u003e\n\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0633\/0617\/0582\/files\/003_eaa55e14-a613-4611-bdd6-270d77847e2c.png?v=1794378025\" alt=\"Hobbywing SeaKing 120A V4 IP67 waterproof brushless marine ESC with integrated water cooling\"\u003e\u003c\/p\u003e\n\u003c\/div\u003e\n\u003ch3 style=\"font-size: 17px; font-weight: bold; color: #111; margin: 22px 0 8px;\"\u003eSlimmer V4 Housing for Easier Installation\u003c\/h3\u003e\n\u003cp style=\"margin: 0 0 14px;\"\u003eDespite its higher current rating, the SeaKing 120A V4 maintains a relatively compact housing measuring \u003cstrong\u003e64.7 × 36.3 × 22.5mm\u003c\/strong\u003e, excluding the water-cooling pipe.\u003c\/p\u003e\n\u003cp style=\"margin: 0 0 14px;\"\u003eHobbywing's V4 design is approximately 10% narrower than the previous SeaKing 120A V3 generation, helping simplify installation in narrow RC boat hulls.\u003c\/p\u003e\n\u003cp style=\"margin: 0 0 14px;\"\u003eThe slimmer construction provides more flexibility when organizing the ESC, motor, battery, receiver and cooling tubing inside a boat. At 123.5g including wires and motor connectors, the 120A V4 is also only slightly heavier than the 90A V4 despite its increased continuous current capacity and voltage range.\u003c\/p\u003e\n\u003cp style=\"margin: 0 0 14px;\"\u003eFor boat builders upgrading from a previous-generation SeaKing ESC, the new housing dimensions should be checked against the existing mounting arrangement and water-cooling layout before installation.\u003c\/p\u003e\n\u003cdiv class=\"cnhl-img\"\u003e\n\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0633\/0617\/0582\/files\/006_656b3a69-c3ed-4ae8-9d81-53be2cf08dfd.png\" alt=\"Hobbywing SeaKing 120A V4 slim 36.3mm width compared with previous SeaKing 120A V3 ESC\"\u003e\u003c\/p\u003e\n\u003c\/div\u003e\n\u003ch3 style=\"font-size: 17px; font-weight: bold; color: #111; margin: 22px 0 8px;\"\u003e8A Switch-Mode BEC with 6V \/ 7.4V \/ 8.4V Output\u003c\/h3\u003e\n\u003cp style=\"margin: 0 0 14px;\"\u003eThe integrated switch-mode BEC supplies regulated power to compatible receivers and steering servos, helping simplify the electrical system without requiring a separate receiver battery in suitable installations.\u003c\/p\u003e\n\u003cp style=\"margin: 0 0 14px;\"\u003eThe SeaKing 120A V4 provides an \u003cstrong\u003e8A rated BEC output with three selectable voltage settings: 6V, 7.4V and 8.4V\u003c\/strong\u003e.\u003c\/p\u003e\n\u003cp style=\"margin: 0 0 14px;\"\u003eThe 6V setting is appropriate for compatible standard-voltage electronics. The 7.4V and 8.4V options support receivers and high-voltage servos specifically rated for these voltages.\u003c\/p\u003e\n\u003cp style=\"margin: 0 0 14px;\"\u003eThis flexibility is useful when building a larger RC boat that uses more demanding steering electronics. However, the voltage selection must always match the connected receiver and servo specifications, and the equipment's current requirements must remain within the supported BEC capacity.\u003c\/p\u003e\n\u003cdiv style=\"background: #fff7fb; border-left: 4px solid #E60073; padding: 13px 16px; margin: 16px 0;\"\u003e\n\u003cstrong style=\"color: #111;\"\u003eBEC Voltage Reminder\u003c\/strong\u003e\n\u003cp style=\"margin: 6px 0 0;\"\u003e6V, 7.4V and 8.4V are selectable output settings, not simultaneous outputs. Never select a BEC voltage higher than the maximum rating of the connected receiver or steering servo. The published product specification lists an 8A BEC rating for the SeaKing 120A V4.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003ch3 style=\"font-size: 17px; font-weight: bold; color: #111; margin: 22px 0 8px;\"\u003eCapacitor Overheating Protection\u003c\/h3\u003e\n\u003cp style=\"margin: 0 0 14px;\"\u003eThe SeaKing 120A V4 includes dedicated \u003cstrong\u003ecapacitor overheating protection\u003c\/strong\u003e to help reduce the risk of damage caused by abnormal thermal conditions in the ESC's power components.\u003c\/p\u003e\n\u003cp style=\"margin: 0 0 14px;\"\u003eUnder heavy electrical loads, excessive capacitor temperature can affect ESC reliability. The additional protection system monitors abnormal temperature conditions and responds by reducing output.\u003c\/p\u003e\n\u003cp style=\"margin: 0 0 14px;\"\u003eAccording to Hobbywing's official manual, when capacitor overheating protection is triggered, the ESC reduces its power output to approximately 50%. Full output can be restored automatically after the temperature drops sufficiently.\u003c\/p\u003e\n\u003cp style=\"margin: 0 0 14px;\"\u003eThis protection is available on both the 90A and 120A V4 models, distinguishing them from the smaller SeaKing 30A and 60A V4 versions, which do not include dedicated capacitor overheating protection.\u003c\/p\u003e\n\u003cp style=\"margin: 0 0 14px;\"\u003eThe protection function is an additional safeguard, not permission to exceed the ESC's current rating or operate without effective water cooling.\u003c\/p\u003e\n\u003cdiv class=\"cnhl-img\"\u003e\n\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0633\/0617\/0582\/files\/008_6b73b234-3003-47e4-af48-9ec596d8413c.png?v=1794387112\" alt=\"Hobbywing SeaKing 120A V4 capacitor overheating protection for high-current RC boat power systems\"\u003e\u003c\/p\u003e\n\u003c\/div\u003e\n\u003ch3 style=\"font-size: 17px; font-weight: bold; color: #111; margin: 22px 0 8px;\"\u003eAdjustable Freewheeling for Improved Throttle Response\u003c\/h3\u003e\n\u003cp style=\"margin: 0 0 14px;\"\u003eHobbywing's Freewheeling technology helps improve motor-control efficiency, throttle linearity and ESC temperature behavior under comparable operating conditions.\u003c\/p\u003e\n\u003cp style=\"margin: 0 0 14px;\"\u003eWhen Freewheeling is enabled, the boat can decelerate more quickly when the throttle is released. This can provide a different handling response when approaching turns or making precise speed adjustments.\u003c\/p\u003e\n\u003cp style=\"margin: 0 0 14px;\"\u003eThe SEAKING 120A V4 allows Freewheeling to be enabled or disabled through its programming system, giving operators flexibility to adjust throttle-release behavior according to the boat's setup and handling preferences.\u003c\/p\u003e\n\u003cdiv class=\"cnhl-img\"\u003e\n\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0633\/0617\/0582\/files\/009_0b921594-b7de-4cf1-9ecb-5251394c36bf.png?v=1794378389\" alt=\"Hobbywing SeaKing 120A V4 adjustable Freewheeling function for RC boat deceleration and handling\"\u003e\u003c\/p\u003e\n\u003c\/div\u003e\n\u003ch3 style=\"font-size: 17px; font-weight: bold; color: #111; margin: 22px 0 8px;\"\u003eAUX Channel for Real-Time Parameter Adjustment\u003c\/h3\u003e\n\u003cp style=\"margin: 0 0 14px;\"\u003eThe SEAKING 120A V4 includes an additional yellow AUX signal cable that allows selected ESC parameters to be adjusted through an available receiver channel.\u003c\/p\u003e\n\u003cp style=\"margin: 0 0 14px;\"\u003eWith a properly configured transmitter, the AUX channel can be assigned to supported functions such as maximum reverse force, acceleration punch or drag brake force.\u003c\/p\u003e\n\u003cp style=\"margin: 0 0 14px;\"\u003eInstead of repeatedly connecting a programming device for minor adjustments, operators can use a transmitter switch or control to change the assigned parameter. This can be convenient when fine-tuning handling characteristics during setup.\u003c\/p\u003e\n\u003cp style=\"margin: 0 0 14px;\"\u003eThe receiver must have an available compatible channel, and the AUX function must be configured correctly. Follow the manufacturer's wiring instructions before using the yellow signal cable.\u003c\/p\u003e\n  \n      \u003cdiv class=\"cnhl-img\"\u003e\n\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0633\/0617\/0582\/files\/010_a6c62222-06d0-41d1-8b3a-fefacb527780.png?v=1794378494\" alt=\"Hobbywing SeaKing 120A V4 AUX channel control with yellow signal wire for real-time ESC adjustment\"\u003e\u003c\/p\u003e\n\u003c\/div\u003e\n  \n  \n\u003ch3 style=\"font-size: 17px; font-weight: bold; color: #111; margin: 22px 0 8px;\"\u003eHW LINK Data Logging and Performance Monitoring\u003c\/h3\u003e\n\u003cp style=\"margin: 0 0 14px;\"\u003eThe SeaKing 120A V4 supports performance monitoring through Hobbywing's HW LINK system using a compatible external OTA Bluetooth module.\u003c\/p\u003e\n\u003cp style=\"margin: 0 0 14px;\"\u003eAfter operation, recorded peak values can be accessed through the supported OTA connection. These include:\u003c\/p\u003e\n\u003cul style=\"margin: 0 0 14px; padding-left: 22px;\"\u003e\n\u003cli\u003eMinimum battery voltage\u003c\/li\u003e\n\u003cli\u003eMaximum operating current\u003c\/li\u003e\n\u003cli\u003eMaximum motor RPM\u003c\/li\u003e\n\u003cli\u003eMaximum ESC temperature\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp style=\"margin: 0 0 14px;\"\u003eFor real-time monitoring and historical operating graphs, the OTA module must be connected according to the manufacturer's instructions during operation.\u003c\/p\u003e\n\u003cp style=\"margin: 0 0 14px;\"\u003eSupported real-time information includes throttle position, voltage, temperature and motor speed. Reviewing these readings can help operators understand how battery voltage, propeller load and operating conditions affect the performance of a 6S marine power system.\u003c\/p\u003e\n\u003cp style=\"margin: 0 0 14px;\"\u003eFor example, comparing current and temperature behavior after a propeller change can help determine whether the revised setup places additional load on the ESC. Proper measurement and controlled testing remain important when evaluating the complete propulsion system.\u003c\/p\u003e\n\u003cp style=\"margin: 0 0 14px;\"\u003e\u003cstrong\u003eImportant:\u003c\/strong\u003e Bluetooth is not built directly into the SeaKing 120A V4. An external OTA module is required for Bluetooth-based monitoring and configuration. Independent onboard recording of historical operating graphs is not supported without the appropriate OTA setup.\u003c\/p\u003e\n\n  \n      \u003cdiv class=\"cnhl-img\"\u003e\n  \u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0633\/0617\/0582\/files\/007_b911d0ce-1ca8-4b68-a1a2-4209c7cf305b.png?v=1794387231\" alt=\"Hobbywing SeaKing 120A V4 ESC data logging and real-time monitoring using external OTA Bluetooth module\"\u003e\u003c\/p\u003e\n\u003c\/div\u003e\n\u003ch3 style=\"font-size: 17px; font-weight: bold; color: #111; margin: 22px 0 8px;\"\u003eFirmware Updates and Advanced ESC Programming\u003c\/h3\u003e\n\u003cp style=\"margin: 0 0 14px;\"\u003eThe SEAKING 120A V4 supports firmware upgrades through compatible Hobbywing programming hardware and software, including supported USB LINK and HW LINK update methods.\u003c\/p\u003e\n\u003cp style=\"margin: 0 0 14px;\"\u003eProgramming options include the Hobbywing LED Program Box, LCD G2, LCD Pro and OTA Programmer. Firmware updating requires suitable external programming hardware, such as a compatible LCD programming box or OTA module.\u003c\/p\u003e\n\u003cp style=\"margin: 0 0 14px;\"\u003eThe ESC provides 11 programmable parameter categories, covering running mode, reversing behavior, battery protection, BEC voltage, motor direction, acceleration response, Freewheeling, drag brake, timing and AUX control.\u003c\/p\u003e\n\u003cp style=\"margin: 0 0 14px;\"\u003eThese adjustment options allow the power system to be configured according to the motor, propeller and handling requirements rather than relying entirely on factory settings.\u003c\/p\u003e\n\n  \n     \u003cdiv class=\"cnhl-img\"\u003e\n\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0633\/0617\/0582\/files\/011_b3ec2e9b-1425-476a-8259-da2c52c1286a.png?v=1794378554\" alt=\"Hobbywing SeaKing 120A V4 firmware updates using LCD programming box or external OTA programmer\"\u003e\u003c\/p\u003e\n\u003c\/div\u003e\n\u003ch2 style=\"font-size: 20px; font-weight: bold; color: #111; margin: 30px 0 12px; border-bottom: 1px solid #eee; padding-bottom: 8px;\"\u003eChoosing a 2S–6S LiPo Battery for the SeaKing 120A V4\u003c\/h2\u003e\n\u003cp style=\"margin: 0 0 14px;\"\u003eThe SeaKing 120A V4 supports a wide LiPo voltage range, but the correct battery depends on the motor and propulsion system rather than the ESC alone.\u003c\/p\u003e\n\u003cp style=\"margin: 0 0 14px;\"\u003eA compatible battery must provide the appropriate cell count, sufficient discharge capability, suitable dimensions and a properly rated connector. Higher-capacity or higher-discharge batteries do not automatically increase boat speed, and higher voltage must never exceed the motor's operating limits.\u003c\/p\u003e\n\u003ctable style=\"width: 100%; border-collapse: separate; border-spacing: 0 8px!important; font-size: 14px; line-height: 1.5;\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd style=\"width: 39%; background: #E60073; color: #fff; padding: 10px 12px; font-weight: bold;\"\u003e2S LiPo\u003c\/td\u003e\n\u003ctd style=\"background: #f2f2f2; padding: 10px 12px;\"\u003e7.4V nominal; supported with a suitable brushless marine motor.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"background: #E60073; color: #fff; padding: 10px 12px; font-weight: bold;\"\u003e3S LiPo\u003c\/td\u003e\n\u003ctd style=\"background: #f2f2f2; padding: 10px 12px;\"\u003e11.1V nominal; supported with a properly matched 3S propulsion system.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"background: #E60073; color: #fff; padding: 10px 12px; font-weight: bold;\"\u003e4S LiPo\u003c\/td\u003e\n\u003ctd style=\"background: #f2f2f2; padding: 10px 12px;\"\u003e14.8V nominal; supported for compatible 4S-rated motors.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"background: #E60073; color: #fff; padding: 10px 12px; font-weight: bold;\"\u003e5S LiPo\u003c\/td\u003e\n\u003ctd style=\"background: #f2f2f2; padding: 10px 12px;\"\u003e18.5V nominal; supported where the motor and full power system are rated for 5S operation.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"background: #E60073; color: #fff; padding: 10px 12px; font-weight: bold;\"\u003e6S LiPo\u003c\/td\u003e\n\u003ctd style=\"background: #f2f2f2; padding: 10px 12px;\"\u003e22.2V nominal; maximum supported LiPo cell count for this ESC.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"background: #E60073; color: #fff; padding: 10px 12px; font-weight: bold;\"\u003e7S \/ 8S LiPo\u003c\/td\u003e\n\u003ctd style=\"background: #f2f2f2; padding: 10px 12px;\"\u003eNot supported by the SEAKING 120A V4.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003ch3 style=\"font-size: 17px; font-weight: bold; color: #111; margin: 22px 0 8px;\"\u003eDoes a 6S Battery Automatically Make an RC Boat Faster?\u003c\/h3\u003e\n\u003cp style=\"margin: 0 0 14px;\"\u003eNot necessarily. Increasing battery voltage can raise the motor's potential operating speed, but it can also significantly increase current draw and mechanical load when the motor and propeller remain unchanged.\u003c\/p\u003e\n\u003cp style=\"margin: 0 0 14px;\"\u003eA successful 6S conversion requires the correct motor KV, propeller selection, cooling capacity and battery discharge performance. The ESC's 6S compatibility does not mean every motor or boat originally designed for 4S can safely operate on 6S.\u003c\/p\u003e\n\u003ch3 style=\"font-size: 17px; font-weight: bold; color: #111; margin: 22px 0 8px;\"\u003eBattery Connector and Current Capacity\u003c\/h3\u003e\n\u003cp style=\"margin: 0 0 14px;\"\u003eThe SEAKING 120A V4 is supplied without a battery input connector. Its 12AWG red and black input leads allow the installer to select a suitable connector for the battery and expected operating current.\u003c\/p\u003e\n\u003cp style=\"margin: 0 0 14px;\"\u003eFor high-current marine systems, connector selection should consider current rating, wire gauge, solder-joint quality and operating temperature. Use properly matched connector pairs and avoid undersized connections or unsuitable adapters that could introduce excessive resistance and heat.\u003c\/p\u003e\n\u003cdiv style=\"background: #fff7fb; border-left: 4px solid #E60073; padding: 13px 16px; margin: 16px 0;\"\u003e\n\u003cstrong style=\"color: #111;\"\u003eImportant Electrical Compatibility Note\u003c\/strong\u003e\n\u003cp style=\"margin: 6px 0 0;\"\u003eThe ESC's 120A continuous rating does not establish the safe continuous current of the battery, connector or motor. Every component in the electrical system must be appropriately rated. The 500A peak figure is not a connector-sizing target for continuous operation.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003ch3 style=\"font-size: 17px; font-weight: bold; color: #111; margin: 22px 0 8px;\"\u003eMotor Connection\u003c\/h3\u003e\n\u003cp style=\"margin: 0 0 14px;\"\u003eThe SeaKing 120A V4 uses three 12AWG motor output wires, each approximately 100mm long, terminated with 4.0mm gold female bullet connectors.\u003c\/p\u003e\n\u003cp style=\"margin: 0 0 14px;\"\u003eCheck that the motor has compatible mating connectors. If motor rotation is opposite to the required direction, it can be corrected through the ESC's Motor Rotation programming setting or by exchanging any two motor phase connections while the system is disconnected from power.\u003c\/p\u003e\n\u003ch2 style=\"font-size: 20px; font-weight: bold; color: #111; margin: 30px 0 12px; border-bottom: 1px solid #eee; padding-bottom: 8px;\"\u003eSeaKing 90A V4 vs 120A V4: Which ESC Should You Choose?\u003c\/h2\u003e\n\u003cp style=\"margin: 0 0 14px;\"\u003eThe SeaKing 90A and 120A V4 share several important features, including IP67 waterproofing, an 8A adjustable BEC, capacitor overheating protection, Freewheeling and HW LINK compatibility.\u003c\/p\u003e\n\u003cp style=\"margin: 0 0 14px;\"\u003eThe main differences are battery voltage support, current-handling capability and the recommended application range.\u003c\/p\u003e\n\u003cdiv style=\"overflow-x: auto;\"\u003e\n\u003ctable style=\"width: 100%; border-collapse: collapse; font-size: 14px; line-height: 1.6; margin: 12px 0 16px;\"\u003e\n\u003cthead\u003e\n\u003ctr style=\"background: #E60073; color: #fff;\"\u003e\n\u003cth style=\"padding: 10px; border: 1px solid #ddd; text-align: left;\"\u003eFeature\u003c\/th\u003e\n\u003cth style=\"padding: 10px; border: 1px solid #ddd; text-align: left;\"\u003e90A V4\u003c\/th\u003e\n\u003cth style=\"padding: 10px; border: 1px solid #ddd; text-align: left;\"\u003e120A V4\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd style=\"padding: 9px; border: 1px solid #ddd;\"\u003eContinuous Current\u003c\/td\u003e\n\u003ctd style=\"padding: 9px; border: 1px solid #ddd;\"\u003e90A\u003c\/td\u003e\n\u003ctd style=\"padding: 9px; border: 1px solid #ddd;\"\u003e\u003cstrong\u003e120A\u003c\/strong\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"background: #f5f5f5;\"\u003e\n\u003ctd style=\"padding: 9px; border: 1px solid #ddd;\"\u003ePeak Current\u003c\/td\u003e\n\u003ctd style=\"padding: 9px; border: 1px solid #ddd;\"\u003e360A\u003c\/td\u003e\n\u003ctd style=\"padding: 9px; border: 1px solid #ddd;\"\u003e\u003cstrong\u003e500A\u003c\/strong\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"padding: 9px; border: 1px solid #ddd;\"\u003eLiPo Support\u003c\/td\u003e\n\u003ctd style=\"padding: 9px; border: 1px solid #ddd;\"\u003e2–4S\u003c\/td\u003e\n\u003ctd style=\"padding: 9px; border: 1px solid #ddd;\"\u003e\u003cstrong\u003e2–6S\u003c\/strong\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"background: #f5f5f5;\"\u003e\n\u003ctd style=\"padding: 9px; border: 1px solid #ddd;\"\u003eBEC Output\u003c\/td\u003e\n\u003ctd style=\"padding: 9px; border: 1px solid #ddd;\"\u003e6\/7.4\/8.4V, 8A\u003c\/td\u003e\n\u003ctd style=\"padding: 9px; border: 1px solid #ddd;\"\u003e6\/7.4\/8.4V, 8A\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"padding: 9px; border: 1px solid #ddd;\"\u003eCapacitor Overheat Protection\u003c\/td\u003e\n\u003ctd style=\"padding: 9px; border: 1px solid #ddd;\"\u003eYes\u003c\/td\u003e\n\u003ctd style=\"padding: 9px; border: 1px solid #ddd;\"\u003eYes\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"background: #f5f5f5;\"\u003e\n\u003ctd style=\"padding: 9px; border: 1px solid #ddd;\"\u003eDimensions (mm)\u003c\/td\u003e\n\u003ctd style=\"padding: 9px; border: 1px solid #ddd;\"\u003e60×36.3×22.5\u003c\/td\u003e\n\u003ctd style=\"padding: 9px; border: 1px solid #ddd;\"\u003e64.7×36.3×22.5\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"padding: 9px; border: 1px solid #ddd;\"\u003eWeight\u003c\/td\u003e\n\u003ctd style=\"padding: 9px; border: 1px solid #ddd;\"\u003e115.6g\u003c\/td\u003e\n\u003ctd style=\"padding: 9px; border: 1px solid #ddd;\"\u003e123.5g\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"background: #f5f5f5;\"\u003e\n\u003ctd style=\"padding: 9px; border: 1px solid #ddd;\"\u003eRecommended Boat Length\u003c\/td\u003e\n\u003ctd style=\"padding: 9px; border: 1px solid #ddd;\"\u003e≤80cm\u003c\/td\u003e\n\u003ctd style=\"padding: 9px; border: 1px solid #ddd;\"\u003e\u003cstrong\u003e≤100cm\u003c\/strong\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/div\u003e\n\u003cp style=\"margin: 0 0 14px;\"\u003e\u003cstrong\u003eChoose the SeaKing 90A V4\u003c\/strong\u003e when your boat operates on 2S–4S LiPo and the motor's expected continuous current remains within the 90A rating. It offers the same BEC voltage options and capacitor protection in a slightly smaller and lighter package.\u003c\/p\u003e\n\u003cp style=\"margin: 0 0 14px;\"\u003e\u003cstrong\u003eChoose the SeaKing 120A V4\u003c\/strong\u003e when your setup requires higher continuous current capacity or compatibility with 5S–6S LiPo batteries. Its increased voltage range and 120A rating make it more appropriate for compatible higher-voltage marine propulsion systems.\u003c\/p\u003e\n\u003cp style=\"margin: 0 0 14px;\"\u003eFor additional current ratings and voltage ranges, browse our \u003ca style=\"color: #e60073; text-decoration: underline;\" href=\"https:\/\/chinahobbyline.com\/collections\/hobbywing-seaking-escs\"\u003eHobbywing SeaKing ESC collection\u003c\/a\u003e.\u003c\/p\u003e\n\u003ch2 style=\"font-size: 20px; font-weight: bold; color: #111; margin: 30px 0 12px; border-bottom: 1px solid #eee; padding-bottom: 8px;\"\u003eProgramming and First-Time Setup\u003c\/h2\u003e\n\u003cp style=\"margin: 0 0 14px;\"\u003eThe SEAKING 120A V4 offers 11 programmable parameter categories that help configure the ESC for different brushless marine applications.\u003c\/p\u003e\n\u003cul style=\"margin: 0 0 14px; padding-left: 22px;\"\u003e\n\u003cli\u003e\n\u003cstrong\u003eRunning Mode:\u003c\/strong\u003e Forward Only or Forward and Reverse.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMaximum Reverse Force:\u003c\/strong\u003e Adjust the strength of reverse operation.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eLiPo Cell Count:\u003c\/strong\u003e Automatic detection or manual 2S–6S selection.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eLow-Voltage Cutoff:\u003c\/strong\u003e Configure an appropriate LiPo protection threshold.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBEC Voltage:\u003c\/strong\u003e Select 6V, 7.4V or 8.4V.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMotor Rotation:\u003c\/strong\u003e Configure clockwise or counterclockwise rotation.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePunch:\u003c\/strong\u003e Seven acceleration-response levels.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFreewheeling:\u003c\/strong\u003e Enable or disable the function.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDrag Brake Force:\u003c\/strong\u003e Adjust neutral-throttle braking.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMotor Timing:\u003c\/strong\u003e Configure timing to suit the motor and operating conditions.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAUX Channel Function:\u003c\/strong\u003e Assign supported real-time transmitter adjustments.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3 style=\"font-size: 17px; font-weight: bold; color: #111; margin: 22px 0 8px;\"\u003eProgramming Connections\u003c\/h3\u003e\n\u003cp style=\"margin: 0 0 14px;\"\u003eThe SeaKing 120A V4 supports compatible Hobbywing LED, LCD G2, LCD Pro and OTA programming equipment.\u003c\/p\u003e\n\u003cp style=\"margin: 0 0 14px;\"\u003eWhen using a programming box, follow the official manual's instructions for connecting the throttle signal cable and yellow signal cable to the appropriate programming interfaces. Correct signal alignment and polarity are essential.\u003c\/p\u003e\n\u003cp style=\"margin: 0 0 14px;\"\u003eWhen using the OTA Bluetooth module, follow the corresponding Y-cable instructions. The wiring arrangement for peak-value reading and the arrangement used for real-time and historical graph monitoring are described separately in the official manual.\u003c\/p\u003e\n\u003cp style=\"margin: 0 0 14px;\"\u003eCompatible programming tools can be found in our \u003ca style=\"color: #e60073; text-decoration: underline;\" href=\"https:\/\/chinahobbyline.com\/collections\/esc-programmers-accessories\"\u003eESC Programmers \u0026amp; Accessories\u003c\/a\u003e collection.\u003c\/p\u003e\n\u003ch3 style=\"font-size: 17px; font-weight: bold; color: #111; margin: 22px 0 8px;\"\u003eFirst-Time Setup Checklist\u003c\/h3\u003e\n\u003col style=\"margin: 0 0 14px; padding-left: 22px;\"\u003e\n\u003cli\u003eConfirm the ESC, brushless motor, battery and receiver connections are correct.\u003c\/li\u003e\n\u003cli\u003eInstall and secure the water-cooling tubing.\u003c\/li\u003e\n\u003cli\u003eSet the transmitter throttle parameters to the required calibration positions.\u003c\/li\u003e\n\u003cli\u003ePerform throttle-range calibration according to the official manual.\u003c\/li\u003e\n\u003cli\u003eVerify that the detected LiPo cell count matches the connected battery.\u003c\/li\u003e\n\u003cli\u003eConfigure BEC voltage and low-voltage cutoff settings.\u003c\/li\u003e\n\u003cli\u003eSelect the appropriate running mode and motor rotation direction.\u003c\/li\u003e\n\u003cli\u003eCheck throttle operation with the propeller safely clear of people and objects.\u003c\/li\u003e\n\u003cli\u003eVerify cooling-water flow before operating at significant motor load.\u003c\/li\u003e\n\u003c\/ol\u003e\n\u003cp style=\"margin: 0 0 14px;\"\u003eAlways disconnect the battery after use. The ESC can draw a small amount of power while connected, even when the motor is not running, potentially causing excessive battery discharge during storage.\u003c\/p\u003e\n\u003ch2 style=\"font-size: 20px; font-weight: bold; color: #111; margin: 30px 0 12px; border-bottom: 1px solid #eee; padding-bottom: 8px;\"\u003eElectronic Protection for High-Current Marine Operation\u003c\/h2\u003e\n\u003cp style=\"margin: 0 0 14px;\"\u003eThe SeaKing 120A V4 includes multiple electronic protection functions designed to respond to abnormal operating conditions.\u003c\/p\u003e\n\u003cul style=\"margin: 0 0 14px; padding-left: 22px;\"\u003e\n\u003cli\u003e\n\u003cstrong\u003eLow-Voltage Protection:\u003c\/strong\u003e Helps prevent excessive LiPo battery discharge.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eESC Over-Temperature Protection:\u003c\/strong\u003e Reduces output when ESC temperature becomes excessive.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOver-Current Protection:\u003c\/strong\u003e Responds to abnormal current conditions.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eThrottle Signal Loss Protection:\u003c\/strong\u003e Helps prevent uncontrolled motor operation when the receiver signal is lost.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCapacitor Overheating Protection:\u003c\/strong\u003e Reduces output under excessive capacitor-temperature conditions.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp style=\"margin: 0 0 14px;\"\u003eThese safeguards improve operating reliability, but they cannot compensate for an unsuitable motor, an overloaded propeller, inadequate cooling or undersized electrical connections.\u003c\/p\u003e\n\u003cp style=\"margin: 0 0 14px;\"\u003eThe 120A continuous current rating remains the key reference when evaluating sustained power-system load.\u003c\/p\u003e\n  \n\n  \n      \u003cdiv class=\"cnhl-img\"\u003e\n\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0633\/0617\/0582\/files\/002_86ec64d3-0867-48af-9b6a-b11c61a76ca7.png?v=1794385967\" alt=\"Hobbywing SeaKing 120A V4 ESC protection against low voltage overheating overcurrent and throttle signal loss\"\u003e\u003c\/p\u003e\n\u003c\/div\u003e\n  \n\u003ch2 style=\"font-size: 20px; font-weight: bold; color: #111; margin: 30px 0 12px; border-bottom: 1px solid #eee; padding-bottom: 8px;\"\u003eOfficial Hobbywing SEAKING 120A V4 Manual\u003c\/h2\u003e\n\u003cp style=\"margin: 0 0 14px;\"\u003eFor detailed wiring instructions, throttle calibration, programming methods, adjustable parameters, LED indicators, protection behavior and troubleshooting, refer to the official Hobbywing SEAKING V4 user manual.\u003c\/p\u003e\n\u003cp style=\"margin: 0 0 14px;\"\u003e\u003ca style=\"color: #e60073; text-decoration: underline; font-weight: bold;\" href=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0633\/0617\/0582\/files\/Hobbywing_SEAKING_120A-90A-60A-30A_V4__Manual.pdf?v=1794375916\" target=\"_blank\" rel=\"noopener noreferrer\"\u003eDownload Hobbywing SEAKING 120A V4 User Manual (PDF)\u003c\/a\u003e\u003c\/p\u003e\n\u003cp style=\"font-size: 13px; color: #666; margin: 0 0 14px;\"\u003eThe manual also covers the SEAKING 30A, 60A and 90A V4 models. Always follow the 120A-specific specifications and connection instructions.\u003c\/p\u003e\n\u003ch2 style=\"font-size: 20px; font-weight: bold; color: #111; margin: 30px 0 12px; border-bottom: 1px solid #eee; padding-bottom: 8px;\"\u003eExplore More Hobbywing Marine ESCs \u0026amp; Accessories\u003c\/h2\u003e\n\u003cp style=\"margin: 0 0 14px;\"\u003eLooking for a different current rating or building another RC boat power system? Explore our \u003ca style=\"color: #e60073; text-decoration: underline;\" href=\"https:\/\/chinahobbyline.com\/collections\/hobbywing-seaking-escs\"\u003eHobbywing SeaKing ESC collection\u003c\/a\u003e to compare marine speed controllers across the SeaKing series, or browse our \u003ca style=\"color: #e60073; text-decoration: underline;\" href=\"https:\/\/chinahobbyline.com\/collections\/rc-boat-escs\"\u003eRC Boat ESC collection\u003c\/a\u003e for more electronic speed controllers designed for brushless marine applications.\u003c\/p\u003e\n\u003cp style=\"margin: 0 0 14px;\"\u003eFor additional speed controllers and setup tools, visit our \u003ca style=\"color: #e60073; text-decoration: underline;\" href=\"https:\/\/chinahobbyline.com\/collections\/hobbywing-escs\"\u003eHobbywing ESC collection\u003c\/a\u003e and \u003ca style=\"color: #e60073; text-decoration: underline;\" href=\"https:\/\/chinahobbyline.com\/collections\/esc-programmers-accessories\"\u003eESC Programmers \u0026amp; Accessories\u003c\/a\u003e.\u003c\/p\u003e\n\u003ch2 style=\"font-size: 20px; font-weight: bold; color: #111; margin: 30px 0 12px; border-bottom: 1px solid #eee; padding-bottom: 8px;\"\u003eFrequently Asked Questions\u003c\/h2\u003e\n\u003ch3 style=\"font-size: 16px; font-weight: bold; color: #111; margin: 18px 0 6px;\"\u003eDoes the Hobbywing SeaKing 120A V4 support 6S LiPo batteries?\u003c\/h3\u003e\n\u003cp style=\"margin: 0 0 12px;\"\u003eYes. The SeaKing 120A V4 supports 2S through 6S LiPo batteries, with 6S being the maximum supported cell count. The connected motor and complete propulsion system must also be compatible with the selected voltage.\u003c\/p\u003e\n\u003ch3 style=\"font-size: 16px; font-weight: bold; color: #111; margin: 18px 0 6px;\"\u003eCan I use the SeaKing 120A V4 with a 4S battery?\u003c\/h3\u003e\n\u003cp style=\"margin: 0 0 12px;\"\u003eYes. The ESC supports 4S LiPo operation as well as 2S, 3S, 5S and 6S. It does not require a 6S battery to operate, but the motor and power system must be correctly matched to the chosen voltage.\u003c\/p\u003e\n\u003ch3 style=\"font-size: 16px; font-weight: bold; color: #111; margin: 18px 0 6px;\"\u003eIs the SeaKing 120A V4 waterproof?\u003c\/h3\u003e\n\u003cp style=\"margin: 0 0 12px;\"\u003eYes. It features IP67 waterproof and dustproof protection. Proper water cooling is still required, and exposed electrical connectors should be inspected and dried after use to reduce corrosion risk.\u003c\/p\u003e\n\u003ch3 style=\"font-size: 16px; font-weight: bold; color: #111; margin: 18px 0 6px;\"\u003eWhat size RC boat is the SeaKing 120A V4 suitable for?\u003c\/h3\u003e\n\u003cp style=\"margin: 0 0 12px;\"\u003eHobbywing recommends the SeaKing 120A V4 for boats up to 100cm in length. Actual suitability depends on motor load, battery voltage, propeller selection, cooling performance and installation space.\u003c\/p\u003e\n\u003ch3 style=\"font-size: 16px; font-weight: bold; color: #111; margin: 18px 0 6px;\"\u003eWhat is the difference between SeaKing 90A V4 and 120A V4?\u003c\/h3\u003e\n\u003cp style=\"margin: 0 0 12px;\"\u003eThe 120A V4 increases continuous current capacity from 90A to 120A and extends battery compatibility from 4S to 6S LiPo. Its peak current rating is also higher at 500A compared with 360A for the 90A model. Both offer an 8A adjustable BEC and capacitor overheating protection.\u003c\/p\u003e\n\u003ch3 style=\"font-size: 16px; font-weight: bold; color: #111; margin: 18px 0 6px;\"\u003eCan I use the SeaKing 120A V4 in a boat smaller than 100cm?\u003c\/h3\u003e\n\u003cp style=\"margin: 0 0 12px;\"\u003eYes, provided the ESC fits physically and the electrical and cooling requirements are satisfied. The 100cm figure is Hobbywing's recommended upper boat-length guideline, not a required minimum hull length.\u003c\/p\u003e\n\u003ch3 style=\"font-size: 16px; font-weight: bold; color: #111; margin: 18px 0 6px;\"\u003eWhat is the BEC output of the SeaKing 120A V4?\u003c\/h3\u003e\n\u003cp style=\"margin: 0 0 12px;\"\u003eThe integrated switch-mode BEC is rated at 8A and supports selectable 6V, 7.4V and 8.4V output. Choose a setting compatible with the receiver and steering servo, and check the connected equipment's current requirements.\u003c\/p\u003e\n\u003ch3 style=\"font-size: 16px; font-weight: bold; color: #111; margin: 18px 0 6px;\"\u003eDoes the SeaKing 120A V4 include capacitor overheating protection?\u003c\/h3\u003e\n\u003cp style=\"margin: 0 0 12px;\"\u003eYes. The ESC includes dedicated capacitor overheating protection that reduces output under excessive capacitor-temperature conditions. This protection is also available on the 90A V4 but not on the smaller 30A and 60A V4 models.\u003c\/p\u003e\n\u003ch3 style=\"font-size: 16px; font-weight: bold; color: #111; margin: 18px 0 6px;\"\u003eCan Freewheeling be enabled or disabled?\u003c\/h3\u003e\n\u003cp style=\"margin: 0 0 12px;\"\u003eYes. The SeaKing 120A V4 allows Freewheeling to be enabled or disabled through compatible programming equipment. This function can change throttle-release deceleration and motor-control behavior.\u003c\/p\u003e\n\u003ch3 style=\"font-size: 16px; font-weight: bold; color: #111; margin: 18px 0 6px;\"\u003eDoes the SeaKing 120A V4 have built-in Bluetooth?\u003c\/h3\u003e\n\u003cp style=\"margin: 0 0 12px;\"\u003eNo. The SeaKing 120A V4 requires a compatible external Hobbywing OTA Bluetooth module for supported HW LINK app connectivity, parameter adjustment and performance monitoring.\u003c\/p\u003e\n\u003ch3 style=\"font-size: 16px; font-weight: bold; color: #111; margin: 18px 0 6px;\"\u003eCan the SeaKing 120A V4 record performance data?\u003c\/h3\u003e\n\u003cp style=\"margin: 0 0 12px;\"\u003eYes. The ESC supports peak-value recording and real-time data monitoring. Historical operating graphs require a compatible external OTA module connected during operation. Independent built-in historical graph recording is not supported.\u003c\/p\u003e\n\u003ch3 style=\"font-size: 16px; font-weight: bold; color: #111; margin: 18px 0 6px;\"\u003eCan I update the SeaKing 120A V4 firmware?\u003c\/h3\u003e\n\u003cp style=\"margin: 0 0 12px;\"\u003eYes. Firmware upgrades are supported using compatible Hobbywing programming hardware and software. A suitable LCD programming box or external OTA module is required for the corresponding update method.\u003c\/p\u003e\n\u003ch3 style=\"font-size: 16px; font-weight: bold; color: #111; margin: 18px 0 6px;\"\u003eWhich programming devices work with the SeaKing 120A V4?\u003c\/h3\u003e\n\u003cp style=\"margin: 0 0 12px;\"\u003eThe ESC supports compatible Hobbywing LED Program Box, LCD G2, LCD Pro and OTA programming devices. Follow the official throttle-signal and yellow-signal cable connection instructions before programming.\u003c\/p\u003e\n\u003ch3 style=\"font-size: 16px; font-weight: bold; color: #111; margin: 18px 0 6px;\"\u003eDoes the SeaKing 120A V4 include a battery connector?\u003c\/h3\u003e\n\u003cp style=\"margin: 0 0 12px;\"\u003eNo. The ESC is supplied with bare 12AWG battery input leads. A connector suitable for the battery and expected current must be installed. The motor output wires have 4.0mm gold female bullet connectors.\u003c\/p\u003e\n\u003ch3 style=\"font-size: 16px; font-weight: bold; color: #111; margin: 18px 0 6px;\"\u003eCan the SeaKing 120A V4 run two brushless motors?\u003c\/h3\u003e\n\u003cp style=\"margin: 0 0 12px;\"\u003eNo. The ESC is designed to control one compatible sensorless brushless motor. A single SeaKing 120A V4 should not be used to drive two brushless motors. Twin-motor boat setups require appropriately selected motor controllers.\u003c\/p\u003e\n\u003ch3 style=\"font-size: 16px; font-weight: bold; color: #111; margin: 18px 0 6px;\"\u003eIs the 500A peak current rating suitable for continuous operation?\u003c\/h3\u003e\n\u003cp style=\"margin: 0 0 12px;\"\u003eNo. The 500A figure is the ESC's peak current rating, not its continuous operating capacity. The rated continuous current is 120A, and actual operating load must remain within the capabilities of the complete propulsion system under appropriate cooling conditions.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"ChinaHobbyLine","offers":[{"title":"Global","offer_id":67944532967638,"sku":"30302363 GL","price":77.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0633\/0617\/0582\/files\/001_4799526b-b61f-4904-9043-9cfce684b760.webp?v=1794387705","url":"https:\/\/chinahobbyline.com\/id\/products\/hobbywing-seaking-120a-v4-brushless-rc-boat-esc","provider":"ChinaHobbyLine","version":"1.0","type":"link"}