Hobbywing Platinum 25A 6S V4 is a compact aircraft brushless ESC designed for Oxy Heli 2 upgrades, small electric helicopters, and lightweight fixed-wing aircraft using 3–6S LiPo power systems. With 25A continuous current, 40A peak current, a built-in 6V/7.4V switch-mode BEC, 32-bit 72MHz processor control, DEO technology, Reverse Brake support, and a lightweight 27g body, this ESC is built for pilots who need precise throttle control in a small power system.
Unlike larger Platinum V5 helicopter ESCs, the Platinum 25A 6S V4 is focused on small models where size, weight, governor feel, BEC reliability, and clean wiring matter more than high-current headroom. It is a practical upgrade choice for compact helicopters such as Oxy Heli 2-style builds when the motor, battery voltage, connector, servo load, and installation space are compatible.
Key features include 3–6S LiPo support, 25A continuous current, 40A peak current, 6V/7.4V switch-mode BEC, 18KHz PWM, 3.5mm female motor connectors, separate programming port, LCD program box / OTA programmer support, DEO driving efficiency optimization, Reverse Brake mode, and multiple protection functions.
Quick Fit Check
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Best for: Oxy Heli 2 upgrades, small RC helicopters, and compact fixed-wing aircraft.
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Battery platform: 3–6S LiPo.
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Current rating: 25A continuous / 40A peak for 10 seconds.
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BEC type: Built-in switch-mode BEC, 6V / 7.4V selectable, 3A continuous / 7A peak.
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Processor: High-performance 32-bit processor with 72MHz running frequency.
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PWM: 18KHz.
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Motor connectors: 3.5mm gold connectors, female.
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Weight: Approx. 27g.
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Programming: Separate programming port for LCD program box or OTA programmer, sold separately.
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Important: Check motor current, LiPo voltage, servo load, BEC voltage, connector type, cooling airflow, and installation space before use.
Product Specifications
| Brand |
Hobbywing |
| Series |
Platinum V4 |
| Model |
Platinum 25A ESC V4 |
| Continuous / Peak Current |
25A / 40A for 10 seconds |
| Input Voltage |
3–6S LiPo |
| BEC |
Switch-mode BEC, 6V / 7.4V selectable, 3A continuous / 7A peak |
| PWM |
18KHz |
| Programming Port |
Separate programming port for LCD program box or OTA programmer |
| Signal / BEC / RPM Wires |
White throttle signal wire, red and black BEC output wires, yellow RPM signal transmission wire |
| Input Wires |
Red 16AWG 100mm × 1 / Black 16AWG 100mm × 1 |
| Output Wires |
Black 18AWG 75mm × 3 |
| Output Connectors |
3.5mm gold connectors, female |
| Size (L × W × H) |
47 × 22 × 10mm |
| Approx Weight |
27g |
| Application |
Oxy Heli 2 upgrade, small electric helicopters, and small fixed-wing aircraft |
| Stock Number |
PLATINUM-25A-6S-V4 |
Designed for Oxy Heli 2 Upgrade and Small Helicopters
The Platinum 25A 6S V4 is a natural fit for Oxy Heli 2-style upgrade projects because it combines a compact 47 × 22 × 10mm body, 27g weight, 3–6S LiPo support, and a built-in 6V/7.4V BEC. For small helicopters, every gram and every millimeter matters, so this ESC is much more appropriate than a larger 80A, 120A, or 150A Platinum ESC.
Its 25A continuous current rating gives small helicopter pilots a clean current class for lightweight power systems, while the 40A peak rating provides short-duration headroom. Always confirm the actual motor current, blade load, gear ratio, battery voltage, connector type, and cooling airflow before flight.
Setup note: Oxy Heli 2 and similar small helicopters can vary by motor, gearing, servo setup, battery voltage, and flying style. Use the ESC only when your setup stays within the 25A continuous / 40A peak current range and the 6V/7.4V BEC is compatible with your electronics.
Excellent Motor Governing Speed
The Platinum 25A 6S V4 uses a high-performance 32-bit processor with a running frequency of 72MHz. Combined with Hobbywing’s helicopter governor algorithm, it is designed to deliver precise speed control for small electric helicopters.
For Oxy Heli 2-style builds, stable governing helps the helicopter feel more consistent during collective changes, climbs, descents, and sport flying. Governor performance still depends on correct motor choice, gearing, throttle setup, battery condition, and mechanical setup.
Built-in 6V / 7.4V Switch-Mode BEC
The built-in switch-mode BEC provides selectable 6V or 7.4V output with 3A continuous current and 7A peak current. This gives small helicopter pilots a simple receiver-side power solution without adding a separate external BEC in many compatible setups.
Before choosing the BEC voltage, confirm your servos, receiver, flybarless controller, and any onboard electronics are compatible with either 6V or 7.4V. Do not select 7.4V unless every connected component supports HV operation.
DEO Technology for Better Efficiency
The Platinum 25A 6S V4 includes DEO, also known as Driving Efficiency Optimization or Active Freewheeling. This technology is designed to improve throttle response, driving efficiency, flight time, and ESC temperature behavior.
In a small helicopter, efficiency matters because the ESC often sits inside a tight frame with limited cooling space. A clean power setup, correct gearing, properly sized LiPo pack, and good airflow all help the ESC work more reliably.
Reverse Brake for Small Fixed-Wing Aircraft
Although the Platinum 25A 6S V4 is strongly positioned for small helicopters, it can also be used in compatible small fixed-wing aircraft. Reverse Brake mode can help reduce landing roll distance when configured correctly for aircraft use.
Reverse Brake is not needed for every model. For helicopter use, focus on governor settings, throttle calibration, BEC voltage, and motor timing. For fixed-wing use, always confirm propeller clearance, ESC settings, motor direction, and safe ground testing before flight.
Multiple Protection Functions
The Platinum 25A 6S V4 includes multiple protection functions for safer operation, including ESC thermal protection, capacitor thermal protection, overload protection, throttle signal loss protection, and low-voltage cutoff.
These protections help reduce risk, but they do not replace correct setup. Overloading the motor, using the wrong LiPo voltage, choosing poor connectors, blocking airflow, or exceeding the BEC capability can still damage the ESC or model electronics.
Separate Programming Port and Firmware Support
A separate programming port allows the ESC to connect to a compatible LCD program box or OTA programmer. This can be used for ESC setup, flight data checking, firmware upgrades, and supported parameter adjustment.
For small helicopters, this makes setup cleaner because the programming connection is separated from the main throttle/BEC wiring. The LCD program box and OTA programmer are sold separately.
Battery Planning for Oxy Heli 2 and Small Helicopters
The Platinum 25A 6S V4 supports 3–6S LiPo batteries. For Oxy Heli 2-style and small helicopter setups, battery choice should be based on the model manual, motor KV, gear ratio, connector type, current draw, flight style, and available frame space.
For helicopter battery planning, browse CNHL Helicopter Batteries. For 6S aircraft and helicopter setups, you can also compare 6S LiPo Batteries. Always confirm battery dimensions, connector type, discharge capability, and actual current draw before flight.
Do not select this ESC by voltage alone. A 6S-capable ESC still needs the correct motor current, prop or rotor load, connector, cooling, and BEC load to operate safely.
Official Manual
Download the official manual here: Hobbywing Platinum 25A / 40A V4 User Manual.
Recommended Collection Paths
FAQ: Hobbywing Platinum 25A 6S V4
What is the Hobbywing Platinum 25A 6S V4 used for?
It is a compact aircraft ESC for Oxy Heli 2 upgrades, small RC helicopters, and compatible small fixed-wing aircraft using 3–6S LiPo batteries.
Is the Platinum 25A V4 suitable for Oxy Heli 2?
Yes, it is positioned as a strong upgrade option for Oxy Heli 2-style setups when the motor current, battery voltage, connector, BEC load, cooling, and installation space are compatible.
Does the Platinum 25A V4 include BEC?
Yes. It includes a switch-mode BEC with selectable 6V or 7.4V output, 3A continuous current, and 7A peak current.
Can I use the 7.4V BEC setting with any servo?
No. Only use 7.4V if your servos, receiver, flybarless system, and onboard electronics support HV voltage. If not, use the correct lower voltage setting.
Is this ESC suitable for 450-size helicopters?
It depends on the specific 450-size setup. The Platinum 25A V4 is better suited to smaller helicopters and lightweight builds. For higher-current 450-size setups, a larger ESC may be required.
Does this ESC support programming?
Yes. It supports programming and firmware upgrade through a compatible LCD program box or OTA programmer, sold separately.
What connectors does the Platinum 25A V4 use?
The ESC uses 3.5mm female gold connectors on the motor output side. The battery-side connector should be selected and soldered according to your battery, current level, and model setup.
