The CNHL Long Range Series 6350mAh 14.4V 4S1P 21700 Li-ion battery is built around one clear priority: maximum usable energy from a lightweight four-cell pack. Using four BAK 65E high-energy 21700 cells, it delivers 91.44Wh of nominal pack energy while the pictured production sample weighs only approximately 324g.
That combination produces approximately 282Wh/kg of finished-pack energy density, including the complete battery structure, XT60 connector, 12AWG power leads and balance wiring. For efficient long-range aircraft, this high pack-level Wh/kg can translate into substantially more energy without battery weight increasing at the same rate.
The BAK 65E platform is positioned as Energy First / Maximum Endurance. This battery is therefore most attractive for efficient long-range FPV, FPV wings and fixed-wing aircraft where stored energy has greater value than extreme burst output. It is not intended to be positioned as a high-C racing or aggressive freestyle LiPo replacement.
Quick Battery Fit & Performance Check
| Battery Type |
21700 Li-ion battery pack |
| Cell Platform |
BAK 65E |
| Configuration |
4S1P / 4 cells |
| Capacity |
6350mAh |
| Nominal Voltage |
14.4V |
| Nominal Pack Energy |
91.44Wh |
| Approx. Weight |
Approx. 324g |
| Approx. Pack Energy Density |
Approx. 282Wh/kg |
| Main Connector |
XT60 |
| Power Wire |
12AWG |
| Performance Direction |
Energy First / Maximum Endurance |
| Primary Applications |
Long-range FPV, FPV wings and efficient fixed-wing aircraft |
Product Specifications
| SKU |
LI635104S70XT60 |
| Series |
CNHL Long Range Series |
| Chemistry |
Rechargeable Li-ion |
| Cell Format |
21700 |
| Cell Model |
BAK 65E |
| Configuration |
4S1P / 4 cells |
| Capacity |
6350mAh |
| Nominal Voltage |
14.4V |
| Nominal Pack Energy |
91.44Wh |
| Main Connector |
XT60 |
| Main Power Wire |
12AWG |
| Approx. Dimensions |
73.5 × 43.5 × 43.5mm (2.89 × 1.71 × 1.71in) |
| Approx. Weight |
324g / 0.71lb |
| Approx. Pack Energy Density |
Approx. 282Wh/kg |
91.44Wh at Only About 324g
The standout specification of this battery is the relationship between stored energy and finished pack weight. With 91.44Wh of nominal energy at approximately 324g, the pack reaches roughly 282Wh/kg.
This is not a bare-cell energy-density figure. It is calculated from the finished battery shown here, including the four 21700 cells, pack construction, XT60 connector, 12AWG power wiring and balance lead.
For flying applications, finished-pack Wh/kg is particularly useful because it reflects the actual battery mass the aircraft must carry in order to access the stored energy.
Approx. 282Wh/kg Finished-Pack Energy Density
The BAK 65E already stands out at the cell level with approximately 310Wh/kg-class gravimetric energy density based on CNHL sample measurements. Even after those cells are assembled into a complete RC battery pack, LI635104S70XT60 retains approximately 282Wh/kg.
That makes energy density one of the defining advantages of this product rather than simply an additional specification. For an efficient aircraft, carrying more watt-hours without adding battery mass at the same rate can directly improve the potential for longer useful operating time.
Actual flight time still depends on aircraft efficiency, propulsion setup, all-up weight, wind, flight profile and how much of the stored energy can be used safely.
27% More Energy with Only About 11% More Weight
The benefit becomes especially clear when this 6350mAh 65E battery is compared with the corresponding CNHL 5000mAh 50D 4S1P XT60 battery.
| Specification |
5000mAh 50D 4S XT60 |
6350mAh 65E 4S XT60 |
| Pack Energy |
72Wh |
91.44Wh |
| Approx. Weight |
292.5g |
324g |
| Pack Wh/kg |
Approx. 246Wh/kg |
Approx. 282Wh/kg |
| Performance Direction |
Power + Energy Balance |
Energy First / Maximum Endurance |
The 65E version stores approximately 27% more nominal energy, while the pictured finished battery weighs only about 10.8% more. The result is approximately 14.7% higher finished-pack gravimetric energy density.
This is why the 6350mAh pack should not be described simply as a higher-capacity version of the 5000mAh battery. It represents a different optimization target: more energy for every kilogram of battery carried.
Powered by BAK 65E – Energy First / Maximum Endurance
The BAK 65E is the high-energy platform in the CNHL 21700 Long Range family. Its purpose is not to replace the 50D in every application, but to provide a different option for systems where maximum stored energy is more valuable than additional current headroom.
In an efficient aircraft that spends most of its operating time at moderate electrical loads, this energy-focused design can be especially effective. The aircraft carries substantially more watt-hours while battery weight increases much more slowly than stored energy.
For applications with greater sustained or repeated high-current demand, a more power-oriented battery platform may remain the better direction.
4S1P High-Energy Architecture
LI635104S70XT60 uses a 4S1P architecture with only four 21700 cells. This allows the battery to provide 6350mAh capacity and 91.44Wh of nominal energy without adding a second parallel cell group.
Keeping the architecture at 1P is particularly valuable for weight-sensitive long-range aircraft. Moving to 2P provides much more total capacity and parallel load sharing, but also doubles the cell count.
The 4S1P 65E configuration therefore occupies a useful position between compact aircraft packaging and maximum possible cell-level stored energy.
4S Li-ion Battery for Ultra-Endurance FPV
This XT60 configuration is particularly relevant to efficient long-range FPV systems where endurance takes priority over aggressive power delivery. Its high pack-level energy density allows significantly more stored energy to be carried without moving directly to a heavier 2P architecture.
For multirotors, battery weight still affects hover power continuously, so the pack is most appropriate for aircraft whose motors, propellers and all-up weight have been optimized for efficient cruising.
Explore additional endurance-oriented products in the CNHL Li-ion long range FPV battery collection.
An Excellent Energy-Focused Battery for FPV Wings
FPV wings are one of the strongest application directions for this 6350mAh battery because efficient fixed-wing cruise can make particularly good use of a high-energy-density Li-ion pack.
Once established in cruise, a well-designed wing may require relatively modest propulsion power. That allows more of the 91.44Wh energy budget to be converted into useful distance and operating time.
Launch current, climb current, battery-bay dimensions, total aircraft weight and center of gravity must still be checked before installation.
4S High-Energy Battery for Efficient RC Airplanes
The XT60 connector does not restrict this battery to FPV use. Efficient fixed-wing RC airplanes, gliders and sailplanes using XT60 can also benefit from its high energy-to-weight performance when current demand remains appropriate for the energy-focused 65E platform.
For fixed-wing aircraft, battery weight, position and center of gravity are especially important. The higher capacity is useful only when the aircraft can carry the additional mass efficiently and remain within its intended balance range.
Browse the CNHL Li-ion batteries for RC airplanes and fixed-wing aircraft collection for additional endurance-oriented options.
XT60 Connector with 12AWG Power Leads
LI635104S70XT60 uses an XT60 main power connector with 12AWG leads, matching a connector ecosystem widely used across long-range FPV, FPV wings and efficient fixed-wing aircraft.
The connector itself does not determine the fundamental capability of the battery. Cell platform, S/P configuration, internal construction, wiring, thermal conditions and actual aircraft current demand must all be considered together.
Compact 73.5 × 43.5 × 43.5mm Pack Size
Despite providing 91.44Wh of nominal energy, the finished battery measures approximately 73.5 × 43.5 × 43.5mm. The 4S1P architecture keeps the pack relatively compact because all four cells remain in a single parallel group.
Measure the actual usable battery compartment before purchase and allow additional clearance for the XT60 connector, 12AWG wiring, balance lead, mounting straps and cooling airflow.
6350mAh 4S1P vs 12700mAh 4S2P
| Configuration |
Main Advantage |
Application Direction |
| 6350mAh 4S1P |
Very high energy density with only four cells |
Weight-sensitive long-range FPV, wings and efficient aircraft |
| 12700mAh 4S2P |
Twice the parallel capacity plus current sharing |
Larger wings, fixed-wing aircraft and UAV systems capable of carrying more battery mass |
More capacity does not automatically mean better endurance. The 1P battery can be the more efficient choice when reducing battery mass is important, while 2P becomes attractive when the airframe is large enough to benefit from additional stored energy and parallel load sharing.
Part of the CNHL 4S 21700 Long Range Platform
This battery belongs to the CNHL 4S 21700 Li-ion battery range, where 5000mAh, 6350mAh, 10000mAh and 12700mAh packs provide different balances of power, energy and battery mass.
It is also part of the CNHL Long Range Series, built for endurance-oriented FPV, fixed-wing and UAV applications.
For broader comparison, explore all CNHL 21700 Li-ion batteries or the complete CNHL Li-ion battery range.
Charging and Battery Safety
Use charging equipment and settings specifically appropriate for this rechargeable Li-ion battery. Follow the final published voltage and charge-current specifications for the finished 65E battery pack rather than assuming that settings from another lithium chemistry or cell platform are automatically interchangeable.
The BAK 65E is an energy-focused cell platform. Do not interpret its high capacity or high energy density as evidence of high-burst discharge capability. Aircraft propulsion current and battery temperature should remain within the specified limits of the finished pack.
Inspect the battery, wiring, XT60 connector and wrapping before charging or flight. Do not use or charge a pack that is damaged, excessively hot or electrically abnormal.
During initial aircraft setup, monitor actual propulsion current and pack temperature under realistic loads before relying on the battery for extended-duration operation.
FAQ: CNHL 6350mAh 4S 21700 Li-ion Battery with XT60
What cells are used in this battery?
The battery uses four BAK 65E 6350mAh high-energy 21700 Li-ion cells in a 4S1P configuration.
How much energy does this battery store?
The finished battery is rated at 91.44Wh of nominal pack energy with a 6350mAh capacity and 14.4V nominal product rating.
What is the finished-pack energy density?
Based on the pictured production sample weight of approximately 324g and 91.44Wh nominal energy, calculated finished-pack gravimetric energy density is approximately 282Wh/kg.
Why is this battery significantly more energy-dense than the 5000mAh version?
The BAK 65E is designed around an Energy First philosophy. Compared with the corresponding 5000mAh 50D 4S XT60 battery, this pack provides approximately 27% more nominal energy while the pictured finished-pack weight increases by only about 10.8%.
Is this battery better than the 5000mAh 50D version?
Not for every aircraft. The 6350mAh 65E version is the stronger direction when maximum stored energy and Wh/kg are the priority. The 5000mAh 50D version provides a more power-and-energy-balanced direction when greater usable current headroom is important.
Is this battery suitable for long-range FPV?
Yes, especially for efficient endurance-focused systems whose electrical demand matches the energy-oriented 65E platform. It is not positioned for repeated aggressive high-current freestyle or racing use.
Can it be used in an FPV wing?
Yes. Efficient FPV wings are one of the strongest application directions for this pack because low cruise power can make effective use of its high stored energy and approximately 282Wh/kg finished-pack energy density.
What are the dimensions and weight?
The pictured production battery measures approximately 73.5 × 43.5 × 43.5mm and weighs approximately 324g.
What connector and wire does it use?
LI635104S70XT60 uses an XT60 main connector with 12AWG power leads.
Is higher capacity the same as higher discharge power?
No. The 6350mAh 65E platform is specifically positioned around high stored energy and endurance. Its larger capacity should not be interpreted as greater discharge capability than a more power-oriented cell platform.
