The CNHL Long Range Series 5000mAh 21.6V 6S1P 21700 Li-ion battery combines six BAK 50D cells into a compact 108Wh power system for efficient RC airplanes, fixed-wing aircraft and endurance-oriented UAVs using XT90. Built around the 50D cell platform, this pack balances stored energy with usable power headroom for aircraft that need long operating time without moving entirely toward an energy-only cell design.
At approximately 436g for the pictured production sample, the complete battery delivers roughly 248Wh/kg of pack-level energy density, including the pack structure, XT90 connector, 12AWG power leads and balance wiring.
This XT90 configuration is positioned primarily toward efficient 6S fixed-wing RC airplanes and UAV systems already using the XT90 connector ecosystem. XT90 does not increase the fundamental capability of the BAK 50D cells compared with the corresponding XT60 version; connector selection should follow the aircraft's electrical installation.
Quick Battery Fit & Performance Check
| Battery Type |
21700 Li-ion battery pack |
| Cell Platform |
BAK 50D |
| Configuration |
6S1P / 6 cells |
| Capacity |
5000mAh |
| Nominal Voltage |
21.6V |
| Nominal Energy |
108Wh |
| Approx. Weight |
Approx. 436g |
| Approx. Pack Energy Density |
Approx. 248Wh/kg |
| Main Connector |
XT90 |
| Power Wire |
12AWG |
| Performance Direction |
Power + Energy Balance |
| Primary Applications |
RC airplanes, fixed-wing aircraft and efficient UAV systems |
Product Specifications
| SKU |
LI500106S70XT90 |
| Series |
CNHL Long Range Series |
| Chemistry |
Rechargeable Li-ion |
| Cell Format |
21700 |
| Cell Model |
BAK INR2170-50D |
| Configuration |
6S1P / 6 cells |
| Capacity |
5000mAh |
| Nominal Voltage |
21.6V |
| Maximum Charge Voltage |
25.2V (4.20V per cell) |
| Nominal Energy |
108Wh |
| Main Connector |
XT90 |
| Main Power Wire |
12AWG |
| Approx. Dimensions |
73.5 × 43 × 64.5mm (2.89 × 1.69 × 2.54in) |
| Approx. Weight |
436g / 0.96lb |
| Approx. Pack Energy Density |
Approx. 248Wh/kg |
108Wh in a Compact 6S1P 21700 Battery
Six BAK 50D cells are connected in series to create a 21.6V nominal, 5000mAh and 108Wh 6S1P battery. The single-parallel architecture keeps total cell count to six while providing substantial stored energy for an efficient 6S aircraft.
For fixed-wing applications, this combination can be especially attractive because the aircraft can operate at relatively modest power during efficient cruise while still requiring greater power during takeoff, launch or climbing.
The battery should therefore be evaluated around the entire flight power profile rather than cruise current alone.
Approx. 248Wh/kg Finished-Pack Energy Density
The pictured production battery weighs approximately 436g while storing 108Wh of nominal energy. This gives a calculated finished-pack gravimetric energy density of approximately 248Wh/kg.
Because this figure includes six cells, pack wrapping, XT90 connector, 12AWG power wiring and balance leads, it describes the energy-to-weight performance of the complete battery the aircraft actually carries.
Actual flight or mission endurance will also depend on propulsion efficiency, aircraft weight, payload, wind, flight profile and usable depth of discharge.
Powered by BAK 50D – Power + Energy Balance
The BAK 50D is positioned as the Power + Energy Balance platform within the CNHL 21700 Long Range Series. Each cell provides 5000mAh rated capacity and 18Wh rated energy while retaining greater usable power headroom than an energy-first cell optimized primarily around maximum capacity.
This characteristic is particularly useful for fixed-wing aircraft because their electrical requirements often vary substantially between efficient cruise and higher-load phases such as takeoff, climbing and go-arounds.
The 50D therefore gives this 6S1P battery a practical balance between endurance and usable aircraft power rather than optimizing around only one side of the equation.
BAK 50D Discharge Capability in a 6S1P Pack
The underlying BAK 50D specification includes a maximum discharge condition of up to 5C without temperature cutoff, while an 8C condition is specified only when used with the required 70°C temperature cutoff.
For the 5000mAh cell, those conditions correspond numerically to 25A and 40A. Because this battery uses a 6S1P architecture, propulsion current is not divided between multiple parallel cells.
The 40A figure should not be interpreted as an unrestricted continuous rating for the finished battery. Real pack capability also depends on internal connections, XT90 connector, 12AWG wiring, cooling, battery temperature, ambient conditions and load duration.
Actual propulsion current and battery temperature under realistic operating conditions should be used when determining suitability for a particular aircraft.
6S Li-ion Battery for RC Airplanes
This XT90 configuration is positioned primarily as a 6S Li-ion battery for efficient RC airplanes and fixed-wing aircraft. Gliders, sailplanes, utility aircraft, FPV-capable fixed-wing models and other endurance-oriented airplanes can be strong candidates when their propulsion requirements match the pack.
Compared with a high-C LiPo-oriented power system, the purpose here is to emphasize useful stored energy and endurance while retaining enough usable current headroom for a real fixed-wing flight profile.
Browse additional options in the CNHL Li-ion batteries for RC airplanes and fixed-wing aircraft collection.
A Strong 6S Battery Direction for Gliders and Sailplanes
Electric gliders and sailplanes can be particularly attractive applications for a high-energy Li-ion pack because propulsion may be used primarily during launch and climbing, while much of the flight is spent gliding, thermalling or cruising at very low power.
A 108Wh 6S1P battery gives an appropriately sized aircraft substantial onboard energy without doubling the cell count through a 2P architecture.
Motor-on current, battery compartment dimensions, pack placement and final center of gravity must still be verified before use.
6S Li-ion Battery for Fixed-Wing UAVs
Fixed-wing UAVs are another strong application for this 108Wh 6S battery because aerodynamic efficiency can allow a substantial portion of the stored energy to be used for useful cruise and mission time.
Mapping, inspection, surveying and other endurance-oriented aircraft can benefit when the complete UAV is designed around the pack's voltage, current capability, dimensions and installed mass.
Explore additional mission-oriented configurations in the CNHL Li-ion UAV battery collection.
XT90 Connector with 12AWG Power Leads
LI500106S70XT90 uses an XT90 main power connector with 12AWG leads, making it a natural configuration for larger fixed-wing and UAV electrical systems already built around XT90.
The XT90 connector does not make this battery more powerful than the corresponding XT60 SKU. Both batteries use the same six BAK 50D cells and the same 6S1P architecture.
Choose XT60 or XT90 according to the aircraft wiring and connector ecosystem rather than treating XT90 as a performance upgrade.
Compact 73.5 × 43 × 64.5mm 6S1P Pack
The finished battery measures approximately 73.5 × 43 × 64.5mm. Its compact six-cell layout provides 108Wh without the additional size and mass of a 6S2P battery.
Measure the usable battery bay before purchase and allow additional room for the XT90 connector, 12AWG leads, balance wiring, battery securing system and cooling airflow. For fixed-wing use, verify center of gravity with the battery installed in its intended flight position.
5000mAh 6S1P vs 10000mAh 6S2P
| Configuration |
Main Advantage |
Fixed-Wing / UAV Direction |
| 5000mAh 6S1P |
Lower cell count, compact size and lower pack weight |
Weight-sensitive airplanes, gliders and efficient fixed-wing UAVs |
| 10000mAh 6S2P |
Twice the parallel capacity plus current sharing |
Larger fixed-wing and UAV platforms capable of carrying additional battery mass |
A larger 2P battery only improves useful endurance when the aircraft remains efficient enough to carry the additional six cells. Pack capacity should therefore be selected together with aircraft weight and mission energy requirements.
Part of the CNHL 6S 21700 Long Range Platform
This battery belongs to the CNHL 6S 21700 Li-ion battery range, covering 1P, 2P and 3P configurations for different aircraft sizes and endurance requirements.
It is also part of the CNHL Long Range Series, built around high-energy cylindrical Li-ion battery technology.
For wider comparison, explore all CNHL 21700 Li-ion batteries or the complete CNHL Li-ion battery range.
Charging and Battery Safety
Use a charger and charging mode appropriate for Li-ion chemistry. The BAK 50D cells use a maximum charge voltage of 4.20V per cell, or 25.2V for this complete 6S battery.
Do not assume that a 6S Li-ion battery and a 6S LiPo or LiHV battery use identical charging profiles, low-voltage alarms or cutoff settings. Confirm battery chemistry and actual operating-voltage requirements before use.
Inspect the battery, wiring, XT90 connector and wrapping before charging or flight. Do not operate or charge a pack that is damaged, excessively hot or electrically abnormal.
During initial aircraft setup, monitor propulsion current and battery temperature under realistic loads to confirm that the finished system remains within an appropriate electrical and thermal operating range.
FAQ: CNHL 5000mAh 6S 21700 Li-ion Battery with XT90
What cells are used in this battery?
The pack uses six BAK INR2170-50D 5000mAh 21700 Li-ion cells in a 6S1P configuration.
How much energy does this 6S battery store?
The pack provides 108Wh of nominal stored energy from a 21.6V nominal voltage and 5000mAh capacity.
What is the finished-pack energy density?
Using the pictured production sample weight of approximately 436g and 108Wh nominal energy, calculated pack-level gravimetric energy density is approximately 248Wh/kg.
Is this battery intended for 6S RC airplanes?
Yes. Efficient 6S fixed-wing RC airplanes are the primary application direction for this XT90 configuration, provided the aircraft's voltage, current demand, battery dimensions, weight and center of gravity are compatible.
Can this battery be used in a fixed-wing UAV?
Yes. It can suit endurance-oriented 6S fixed-wing UAV platforms when propulsion current and thermal conditions remain appropriate for the BAK 50D 6S1P battery architecture.
Is the XT90 version more powerful than the XT60 version?
No. Both versions use the same BAK 50D cells and 6S1P architecture. XT90 changes the connection ecosystem and slightly changes finished pack weight, but it does not increase the fundamental electrical capability of the cells.
What are the dimensions and weight?
The pictured battery measures approximately 73.5 × 43 × 64.5mm and weighs approximately 436g.
What connector and wire does it use?
LI500106S70XT90 uses an XT90 main power connector with 12AWG leads.
Can this replace a 6S LiPo airplane battery?
Do not assume direct compatibility based only on the 6S designation and XT90 connector. Compare actual operating voltage, current demand, dimensions, weight, charger settings, low-voltage behavior and aircraft CG before changing battery chemistry.
What is the maximum charge voltage?
The maximum charge voltage is 25.2V for the complete 6S battery, corresponding to 4.20V per cell.
