The CNHL Long Range Series 6350mAh 21.6V 6S1P 21700 Li-ion battery combines six BAK 65E high-energy cells into a 137.16Wh battery pack for efficient RC airplanes, fixed-wing aircraft and endurance-oriented UAV systems using XT90. The 65E platform is designed around maximum stored energy and exceptional energy-to-weight performance rather than extreme burst output.
At approximately 482g for the pictured production sample, the complete battery achieves approximately 285Wh/kg of finished-pack energy density. This figure includes the six-cell assembly, XT90 connector, 12AWG power leads, balance wiring and pack structure that the aircraft actually carries.
This XT90 configuration is positioned primarily for efficient 6S fixed-wing RC airplanes and UAV systems where long operating time and high stored energy are more important than repeated high-current output. XT90 matches a different aircraft connector ecosystem; it does not increase the fundamental capability of the BAK 65E cells compared with the corresponding XT60 version.
Quick Battery Fit & Performance Check
| Battery Type |
21700 Li-ion battery pack |
| Cell Platform |
BAK 65E |
| Configuration |
6S1P / 6 cells |
| Capacity |
6350mAh |
| Nominal Voltage |
21.6V |
| Nominal Pack Energy |
137.16Wh |
| Approx. Weight |
Approx. 482g |
| Approx. Pack Energy Density |
Approx. 285Wh/kg |
| Main Connector |
XT90 |
| Power Wire |
12AWG |
| Performance Direction |
Energy First / Maximum Endurance |
| Primary Applications |
RC airplanes, fixed-wing aircraft and endurance-oriented UAVs |
Product Specifications
| SKU |
LI635106S70XT90 |
| Series |
CNHL Long Range Series |
| Chemistry |
Rechargeable Li-ion |
| Cell Format |
21700 |
| Cell Model |
BAK 65E |
| Configuration |
6S1P / 6 cells |
| Capacity |
6350mAh |
| Nominal Voltage |
21.6V |
| Nominal Pack Energy |
137.16Wh |
| Main Connector |
XT90 |
| Main Power Wire |
12AWG |
| Approx. Dimensions |
73.5 × 43.5 × 65mm (2.89 × 1.71 × 2.56in) |
| Approx. Weight |
482g / 1.06lb |
| Approx. Pack Energy Density |
Approx. 285Wh/kg |
137.16Wh at Only About 482g
The defining feature of this battery is the relationship between stored energy and complete pack weight. With 137.16Wh of nominal energy at approximately 482g, LI635106S70XT90 delivers approximately 285Wh/kg at the finished-pack level.
This figure includes the complete six-cell battery assembly, XT90 connector, 12AWG power leads, balance wiring and external pack structure. It therefore represents the energy-to-weight performance of the battery the aircraft actually carries.
For fixed-wing aircraft and UAVs, that relationship can be more meaningful than capacity alone because battery mass directly affects aircraft weight, payload margin and propulsion efficiency.
Approx. 285Wh/kg Finished-Pack Energy Density
The underlying BAK 65E cell platform reaches approximately 310Wh/kg-class cell-level energy density based on CNHL sample measurements. Even after six cells are assembled into a complete 6S battery with XT90 wiring and pack structure, LI635106S70XT90 retains approximately 285Wh/kg.
That makes high energy density a defining product advantage rather than merely another specification. Efficient aircraft can carry significantly more watt-hours without battery weight increasing at the same rate.
Actual flight duration still depends on aircraft efficiency, propulsion load, payload, wind, mission profile and usable depth of discharge.
27% More Energy with Only About 11% More Weight
Compared with the corresponding CNHL 5000mAh BAK 50D 6S1P XT90 battery, the energy-density advantage of the 65E platform becomes especially clear.
| Specification |
5000mAh 50D 6S XT90 |
6350mAh 65E 6S XT90 |
| Pack Energy |
108Wh |
137.16Wh |
| Approx. Weight |
436g |
482g |
| Pack Wh/kg |
Approx. 248Wh/kg |
Approx. 285Wh/kg |
| Performance Direction |
Power + Energy Balance |
Energy First / Maximum Endurance |
The 65E version stores approximately 27% more nominal energy, while pictured finished-pack weight increases by only about 10.6%. This produces approximately 14.9% higher finished-pack gravimetric energy density.
The result explains the role of the 65E platform: not simply more mAh, but more stored energy for each kilogram of battery carried.
Powered by BAK 65E – Energy First / Maximum Endurance
The BAK 65E is the energy-focused cell platform in the CNHL 21700 Long Range family. It prioritizes high stored energy and gravimetric energy density rather than extreme burst-current output.
That makes the 65E especially relevant to fixed-wing aircraft. Once an efficient airplane reaches cruise, propulsion demand can be relatively modest, allowing the aircraft to make effective use of the additional watt-hours available from a high-energy battery.
For aircraft with greater repeated or sustained current demand, the more power-and-energy-balanced 50D platform may remain the better choice.
6S1P High-Energy Architecture
LI635106S70XT90 uses six 21700 cells in a 6S1P configuration. This provides 6350mAh capacity and 137.16Wh of nominal pack energy while keeping total cell count to six.
Compared with a 6S2P battery, this architecture avoids a second set of six cells and the corresponding increase in battery size and mass. That can be especially valuable in weight-sensitive fixed-wing aircraft.
Because it remains a 1P battery, current is not shared across parallel cell groups. Aircraft current requirements therefore need to remain appropriate for the energy-focused 65E platform.
6S High-Energy Li-ion Battery for RC Airplanes
This XT90 configuration is positioned primarily for efficient 6S RC airplanes and fixed-wing aircraft where endurance is a major design priority. Gliders, sailplanes, endurance-oriented utility aircraft and other efficient fixed-wing models can be strong candidates.
Takeoff, climbing and full-throttle current must still be matched carefully to the battery. The high 6350mAh capacity and 285Wh/kg pack-level energy density should not be interpreted as high-burst performance ratings.
Browse additional options in the CNHL Li-ion batteries for RC airplanes and fixed-wing aircraft collection.
Long-Endurance Battery for Fixed-Wing UAVs
Fixed-wing UAVs are another strong application for this battery because aerodynamic efficiency can allow a large portion of the available 137.16Wh to be converted into useful cruise and mission time.
Mapping, inspection, surveying and aerial-imaging aircraft can benefit from high pack-level energy density when their propulsion systems and mission profiles operate within the electrical and thermal limits of the battery.
Explore additional mission-oriented options in the CNHL Li-ion UAV battery collection.
XT90 Connector with 12AWG Power Leads
LI635106S70XT90 uses an XT90 main power connector with 12AWG leads, making it a natural configuration for fixed-wing aircraft and UAV systems already standardized around XT90.
The corresponding XT60 and XT90 products use the same BAK 65E cells and the same 6S1P architecture. XT90 therefore should not be interpreted as increasing the underlying cell capability.
Choose the connector that matches the aircraft's electrical system rather than treating XT90 as a higher-performance battery version.
Compact 73.5 × 43.5 × 65mm Pack Size
The finished battery measures approximately 73.5 × 43.5 × 65mm. Despite storing 137.16Wh of nominal energy, its six-cell 6S1P construction remains substantially more compact than a corresponding 12-cell 6S2P battery.
Measure the usable battery bay before purchase and leave additional clearance for the XT90 connector, 12AWG wiring, balance lead, securing system and airflow. For fixed-wing aircraft, always verify the final center of gravity with the battery installed.
6350mAh 6S1P vs 12700mAh 6S2P
| Configuration |
Main Advantage |
Fixed-Wing / UAV Direction |
| 6350mAh 6S1P |
Very high Wh/kg with only six cells |
Weight-sensitive airplanes, gliders and efficient fixed-wing UAVs |
| 12700mAh 6S2P |
Twice the capacity with parallel load sharing |
Larger aircraft and UAV systems designed to carry substantially more battery mass |
The 2P architecture provides significantly more total stored energy, but the 1P battery can be the more efficient solution when installed battery mass is the limiting factor.
Part of the CNHL 6S 21700 Long Range Platform
This battery belongs to the CNHL 6S 21700 Li-ion battery range, covering multiple capacities and 1P, 2P and 3P architectures for different endurance and aircraft-size requirements.
It is also part of the CNHL Long Range Series, built around endurance-focused cylindrical Li-ion battery technology.
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 appropriate for the exact finished BAK 65E Li-ion battery specification. Follow the final published charge-voltage and charge-current limits rather than assuming that settings from another Li-ion, LiPo or LiHV battery are interchangeable.
The 65E platform is designed around high stored energy. Do not interpret its 6350mAh capacity, 137.16Wh energy or high Wh/kg figure as evidence of high-burst discharge capability. Aircraft propulsion current and battery temperature must remain appropriate for the finished pack.
Inspect the battery, XT90 connector, wiring and wrapping before charging or flight. Do not use or charge a battery that is damaged, excessively hot or electrically abnormal.
During initial aircraft setup, monitor actual propulsion current and battery temperature under realistic operating conditions before relying on the pack for extended-duration operation.
FAQ: CNHL 6350mAh 6S 21700 Li-ion Battery with XT90
What cells are used in this battery?
The battery uses six BAK 65E 6350mAh high-energy 21700 Li-ion cells in a 6S1P configuration.
How much nominal energy does the battery store?
Using the published 21.6V nominal pack rating and 6350mAh capacity, nominal pack energy is 137.16Wh.
What is the finished-pack energy density?
Based on approximately 137.16Wh and the pictured production sample weight of 482g, calculated finished-pack gravimetric energy density is approximately 285Wh/kg.
Why is this battery more energy-dense than the 5000mAh 6S XT90 version?
The BAK 65E is designed around high stored energy. Compared with the corresponding 5000mAh BAK 50D 6S1P XT90 pack, it provides approximately 27% more nominal energy while the pictured finished-pack weight increases by only about 10.6%.
Is this battery intended for RC airplanes?
Yes. Efficient fixed-wing RC airplanes are the primary application direction for this XT90 configuration, particularly where flight endurance and high energy-to-weight performance are important.
Can it be used for fixed-wing UAVs?
Yes. Mapping, inspection, surveying and other endurance-oriented fixed-wing UAVs can be strong applications when the complete aircraft is compatible with the pack's voltage, dimensions, weight and electrical limits.
Is the XT90 version more powerful than the XT60 version?
No. Both versions use the same BAK 65E cells and the same 6S1P architecture. XT90 changes the connector ecosystem and slightly changes finished pack weight, but does not increase cell-level capability.
What are the dimensions and weight?
The pictured production battery measures approximately 73.5 × 43.5 × 65mm and weighs approximately 482g.
What connector and wire does it use?
LI635106S70XT90 uses an XT90 main power connector with 12AWG leads.
Does 6350mAh mean this pack has higher discharge power than the 5000mAh 50D pack?
No. The higher capacity comes from the energy-focused BAK 65E cell platform. Higher capacity and higher energy density should not be interpreted as greater discharge capability than the more power-and-energy-balanced BAK 50D platform.
