The CNHL Long Range Series 5000mAh 14.4V 4S1P 21700 Li-ion battery combines four BAK 50D cells into a compact 72Wh power system for efficient RC airplanes, fixed-wing aircraft and UAV platforms using XT90. Built around the 50D cell platform, this battery is designed to balance stored energy with usable power headroom for aircraft that prioritize endurance without moving entirely toward an energy-only cell design.
At approximately 296.5g for the pictured production sample, the finished battery delivers roughly 243Wh/kg of pack-level energy density, including the pack assembly, XT90 connector, 12AWG power leads and balance wiring.
The XT90 configuration is positioned primarily toward fixed-wing RC airplanes and UAV systems already built around the XT90 connector ecosystem. XT90 does not make the underlying 50D cells more powerful than the corresponding XT60 version; connector choice should follow the aircraft installation and electrical system.
Quick Battery Fit & Performance Check
| Battery Type |
21700 Li-ion battery pack |
| Cell Platform |
BAK 50D |
| Configuration |
4S1P |
| Capacity |
5000mAh |
| Nominal Voltage |
14.4V |
| Nominal Energy |
72Wh |
| Approx. Weight |
Approx. 296.5g |
| Approx. Pack Energy Density |
Approx. 243Wh/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 |
LI500104S70XT90 |
| Series |
CNHL Long Range Series |
| Chemistry |
Rechargeable Li-ion |
| Cell Format |
21700 |
| Cell Model |
BAK INR2170-50D |
| Configuration |
4S1P / 4 cells |
| Capacity |
5000mAh |
| Nominal Voltage |
14.4V |
| Maximum Charge Voltage |
16.8V (4.20V per cell) |
| Nominal Energy |
72Wh |
| Main Connector |
XT90 |
| Main Power Wire |
12AWG |
| Approx. Dimensions |
73.5 × 43 × 43mm (2.89 × 1.69 × 1.69in) |
| Approx. Weight |
296.5g / 0.65lb |
| Approx. Pack Energy Density |
Approx. 243Wh/kg |
72Wh 4S1P Battery for Efficient Fixed-Wing Aircraft
Four BAK 50D cells are connected in series to create a 14.4V nominal, 5000mAh and 72Wh 4S1P battery. This four-cell architecture keeps the battery relatively compact while providing substantial stored energy for aircraft that can cruise efficiently on a compatible 4S power system.
For fixed-wing applications, the benefit of Li-ion becomes especially relevant once the aircraft reaches efficient cruise. The battery can then devote a greater share of its stored watt-hours to useful flight time rather than repeatedly supporting extreme burst loads.
Launch, takeoff, climb and full-throttle current still need to remain within the electrical and thermal limits of the finished battery.
Approx. 243Wh/kg Finished-Pack Energy Density
The pictured production sample weighs approximately 296.5g while storing a nominal 72Wh. This corresponds to approximately 243Wh/kg of finished-pack gravimetric energy density.
This figure includes the complete battery assembly shown here: four 21700 cells, pack wrapping, XT90 connector, 12AWG power leads and balance wiring. It therefore represents the energy-to-weight ratio of the battery an aircraft actually carries rather than the cell alone.
Actual endurance depends on aircraft efficiency, propulsion setup, payload, wind, flying style and usable depth of discharge.
BAK 50D Power + Energy Balance
The BAK 50D is the Power + Energy Balance cell platform in the CNHL 21700 Long Range family. Each cell provides 5000mAh rated capacity and 18Wh rated energy while offering more usable current headroom than a cell designed primarily around maximum possible capacity.
This characteristic is especially useful in fixed-wing aircraft because the power profile can vary substantially during a flight. Efficient cruise may require relatively modest current, while takeoff, launch, climbing or go-arounds can create significantly higher loads.
The 50D therefore provides a useful middle ground for airplane builders who want long-range Li-ion energy without moving as far toward an energy-only cell direction.
BAK 50D Discharge Capability in This 4S1P Pack
The underlying BAK 50D cell specification includes a maximum discharge condition of up to 5C without a temperature cutoff, while an 8C condition requires the specified 70°C temperature-cutoff control.
For a 5000mAh cell, these correspond numerically to 25A and 40A cell-level conditions. The 40A value should not be interpreted as an unrestricted continuous rating for this finished battery.
Finished-pack performance also depends on cell temperature, internal connections, wire, connector, cooling, load duration and ambient conditions. Aircraft selection should be based on actual measured propulsion current and thermal behavior.
4S Li-ion Battery for RC Airplanes
This XT90 version is positioned primarily for efficient 4S RC airplanes where longer flight duration and stored energy are important. Suitable application directions include gliders, sailplanes, utility aircraft, FPV-capable fixed-wing models and other endurance-oriented airplanes.
Before replacing an existing 4S LiPo with this Li-ion battery, compare the actual voltage range, propulsion current, battery weight, dimensions, center of gravity and charging requirements. Sharing the same 4S designation does not make the two chemistries automatically interchangeable.
Browse other endurance-oriented options in the CNHL Li-ion batteries for RC airplanes and fixed-wing aircraft collection.
A Strong Battery Direction for Gliders and Sailplanes
Electric gliders and sailplanes can be especially compatible with energy-focused battery strategies because the motor may only be used intermittently for launch or climbing, while much of the flight is spent gliding or thermalling at very low propulsion power.
A compact 72Wh 4S1P battery can therefore provide substantial onboard energy without moving directly to the additional cell count and weight of a 4S2P battery.
Motor-on climb current, battery placement and final CG must still be verified because these can determine whether a particular glider is suitable for this Li-ion configuration.
4S Li-ion Battery for Fixed-Wing UAVs
The same 4S1P architecture can also suit efficient fixed-wing UAV systems where mission endurance is more important than extreme burst performance. Mapping, inspection and other long-duration aircraft can benefit when normal cruise current remains moderate and the aircraft is designed around the available 72Wh energy budget.
For additional mission-oriented battery configurations, explore the CNHL Li-ion UAV battery range.
XT90 Connector with 12AWG Power Leads
This SKU uses an XT90 main connector with 12AWG power leads, making it a natural choice for fixed-wing and UAV systems already standardized around XT90.
The XT90 connector should not be interpreted as making this battery electrically stronger than the corresponding XT60 version. Both packs use the same BAK 50D cells and the same 4S1P architecture.
Choose XT60 or XT90 according to the aircraft's connector ecosystem and electrical installation, not as a battery-performance upgrade.
Compact 73.5 × 43 × 43mm Battery Size
The finished battery measures approximately 73.5 × 43 × 43mm, keeping the 4S1P pack relatively compact compared with higher-capacity 4S2P Li-ion batteries.
Before purchase, measure the usable battery compartment and allow additional clearance for the XT90 connector, 12AWG wires, balance lead, mounting straps and airflow. For fixed-wing use, always recheck center of gravity after installation.
5000mAh 4S1P vs 10000mAh 4S2P
| Configuration |
Main Advantage |
Fixed-Wing Direction |
| 5000mAh 4S1P |
Lower cell count, compact dimensions and lower pack mass |
Weight-sensitive RC airplanes, gliders and smaller endurance aircraft |
| 10000mAh 4S2P |
Twice the parallel capacity and greater current sharing |
Larger fixed-wing aircraft and UAVs capable of carrying additional battery mass |
The larger battery is not automatically the better endurance choice. Useful flight-time improvement depends on whether the aircraft can carry the additional cells without losing too much efficiency.
Part of the CNHL 4S 21700 Long Range Platform
This battery belongs to the CNHL 4S 21700 Li-ion battery range, where customers can compare 5000mAh, 6350mAh, 10000mAh and 12700mAh options across different cell platforms and connector configurations.
It is also part of the CNHL Long Range Series, an endurance-focused battery family for FPV, RC airplane and UAV applications.
For wider comparison, browse 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 16.8V for this complete 4S battery.
Do not assume that a 4S Li-ion battery and a 4S LiPo or LiHV battery use identical charging or low-voltage settings. Confirm chemistry, voltage limits and battery-monitoring settings before use.
Inspect the battery, wiring, XT90 connector and wrapping before charging or flight. Do not use a battery that is damaged, excessively hot or electrically abnormal, and never exceed the specified voltage, current or temperature limits.
During initial aircraft setup, monitor propulsion current and battery temperature to confirm that the finished system remains within an appropriate operating range.
FAQ: CNHL 5000mAh 4S 21700 Li-ion Battery with XT90
What cells are used in this battery?
The battery uses four BAK INR2170-50D 5000mAh 21700 Li-ion cells in a 4S1P configuration.
How much energy does this 4S battery store?
It provides 72Wh of nominal stored energy from a 14.4V nominal voltage and 5000mAh capacity.
What is the finished-pack energy density?
Based on the pictured sample weight of approximately 296.5g and 72Wh nominal energy, calculated finished-pack gravimetric energy density is approximately 243Wh/kg.
Is this battery intended for RC airplanes?
Yes. Efficient fixed-wing RC airplanes are the primary application direction for this XT90 configuration, provided voltage, current demand, dimensions, weight and center of gravity are compatible with the model.
Can it be used in a fixed-wing UAV?
Yes, it can suit endurance-oriented fixed-wing UAV systems when the aircraft is designed around a compatible 4S voltage platform and the propulsion current remains within the battery's electrical and thermal limits.
Is the XT90 version more powerful than the XT60 version?
No. Both versions use the same BAK 50D cells and 4S1P architecture. XT90 changes the connector ecosystem and slightly affects finished weight, but it does not increase the fundamental capability of the cells.
What are the dimensions and weight?
The pictured battery measures approximately 73.5 × 43 × 43mm and weighs approximately 296.5g.
What connector and wire does this SKU use?
LI500104S70XT90 uses an XT90 main connector with 12AWG power leads.
Can this replace a 4S LiPo airplane battery?
Do not assume direct compatibility based only on the 4S label and XT90 connector. Compare operating voltage, current requirement, battery dimensions, weight, CG, charger settings and low-voltage behavior before changing battery chemistry.
What is the maximum charge voltage?
The maximum charge voltage is 16.8V for the complete 4S battery, corresponding to 4.20V per cell.
