For battery cells, review the product description for real-world current recommendations, testing notes, and application guidance. Manufacturer maximum ratings should be treated as limits, not the best target for long-term pack health.
Description
BAK 65E N21700CX-65E 21700 Cell - 6500mAh - High-Capacity Lithium-Ion Energy Cell - Check Availability
Typical capacity: 6500mAh
Rated capacity: 6350mAh
Max discharge: 25.4A, not for cycle use
The BAK 65E N21700CX-65E is a high-capacity 21700 lithium-ion rechargeable cell designed for battery packs that prioritize long runtime, high energy per cell, and efficient performance over extreme discharge current.
According to the BAK specification, this cell offers a 6350mAh rated capacity, 6500mAh typical capacity, 3.5V nominal voltage, and up to 22.75Wh typical energy. This makes it a strong option for long-range battery packs, portable power systems, solar backup packs, energy storage builds, and custom 21700 projects where capacity matters more than high-amp discharge.
The datasheet lists a 25.4A maximum discharge current, but this value is marked as not for cycle use. For long service life, this cell should be used in a properly engineered battery pack with correct current sharing, BMS protection, adequate cooling, and temperature monitoring.
Specifications:
| Model | N21700CX-65E |
| Brand | BAK |
| Manufacturer | Zhengzhou BAK Battery Co., Ltd. |
| Size | 21700 |
| Rated Capacity | 6350mAh |
| Typical Capacity | 6500mAh |
| Rated Energy | 22.23Wh |
| Typical Energy | 22.75Wh |
| Nominal Voltage | 3.5V |
| Max Charge Voltage | 4.20V |
| Upper Limited Charge Voltage | 4.25V absolute upper limit, not recommended for normal use |
| End of Discharge Voltage | 2.50V |
| Discharge Cut-Off Voltage | 2.00V absolute lower limit, not recommended for normal use |
| Standard Charge Current | 3175mA |
| Standard Discharge Current | 1270mA |
| Max Charge Current | 12.7A, not for cycle use |
| Max Discharge Current | 25.4A, not for cycle use |
| Rate Discharge Performance | 1C: 100%, 2C: ≥95%, 3C: ≥90%, 4C: ≥85% |
| Chemistry | Lithium-Ion Rechargeable Cell |
| Positive Terminal | Flat Top |
| Protected | No |
| Rechargeable | Yes |
| Internal Resistance | ≤8mΩ AC impedance at 1000Hz |
| Weight | ≤75g |
| Dimensions | Max 21.7mm diameter x max 71.0mm height, with tube |
| Charge Temperature Range | 0°C to 45°C |
| Discharge Temperature Range | -30°C to 60°C |
| Maximum Surface Temperature | Charge: 60°C max, Discharge: 70°C max |
| Storage Temperature | 1 year: -20°C to 25°C, 3 months: -20°C to 45°C, 1 month: -20°C to 60°C |
| Cycle Life | 501st cycle capacity ≥80% of original capacity, tested at 25°C with 0.5C charge and 1C discharge |
| Application Type | High Capacity / Energy Cell |
| Datasheet | Official BAK specification available |
Important note: This is not a 50A or 60A high-power cell. The BAK 65E is best treated as a high-capacity energy cell. The 25.4A maximum discharge current is listed as not for cycle use, so repeated high-current use should be avoided unless the pack is properly engineered and thermally monitored.
Applications:
- ✅ Long-Range E-Bike Battery Packs
- ✅ Electric Scooters with Moderate Current Demand
- ✅ Portable Power Stations
- ✅ Solar and Backup Energy Storage Packs
- ✅ High-Capacity 21700 Battery Builds
- ✅ Applications Prioritizing Runtime Over Extreme Discharge Current
DIY500AMP.COM Design - High Capacity 21700 Energy Cell
⚠️ Safety Warning for Lithium-Ion Battery Usage
Customers should have a clear understanding of lithium-ion battery handling and safety before making a purchase. Lithium-ion batteries are highly sensitive and may pose fire, burn, or explosion risks if improperly handled. Always charge batteries on fire-resistant surfaces, and never leave them charging unattended.
This cell is intended for experienced users and battery-pack builders. It should be used only with proper protection, correct charging equipment, proper current path design, secure mechanical assembly, and adequate temperature monitoring. Compatibility with specific devices is not guaranteed.
By purchasing, you assume full responsibility for any injury, damage, or loss arising from incorrect use, improper pack construction, mishandling, short-circuiting, overheating, overcharging, physical damage, or use outside the manufacturer specifications.
Important Usage Guidelines:
- Not for Use in E-Cigarettes or Similar Devices
- Battery Pack Use Only
- Must Be Used with Proper Protective Circuitry or BMS
- Use Only with a Charger Designed for This Battery Type
- Do Not Exceed 4.20V Charge Voltage for Normal Use
- Do Not Discharge Below 2.50V During Normal Use
- Do Not Treat This as a 50A or 60A High-Power Cell
- Monitor Cell Temperature During High-Load Use
- Spot Weld Only - Do Not Solder Directly
- Do Not Short Circuit the Cell
- Do Not Disassemble, Crush, Puncture, or Deform the Cell
- Do Not Immerse in Water
- Do Not Mix with Other Brands, Types, Models, Old Cells, or Used Cells
- Store in a Cool, Dry, Well-Ventilated Area
- Inspect Before Use and Do Not Use if Wrap Is Damaged
- Keep Away from Loose Metal Objects
- Keep Out of Reach of Children
- Follow Manufacturer Specs Strictly
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Orders ship from Florida when inventory is available. Lithium-ion cells require proper handling, protected packs, correct chargers, and safe storage. Do not solder directly to battery terminals.
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