Explore the specifications for the high-capacity 21700 6000mAh Li-ion battery cell. Featuring a 3.6V nominal voltage, high discharge rates, and robust performance across temperatures. Ideal for high-drain applications.
21700 6000mAh Lithium-Ion Rechargeable Cell
This specification outlines the technical parameters and characteristics of a high-performance cylindrical 21700 lithium-ion rechargeable cell with a nominal capacity of 6000mAh. Designed for reliability and high-drain applications, this cell offers excellent energy density and cycle life.
Quick Specifications
| Parameter |
Specification |
| Model |
21700 |
| Nominal Capacity |
6000 mAh |
| Minimum Capacity |
5850 mAh |
| Nominal Voltage |
3.6 V |
| Charge Cut-off Voltage |
4.2 V |
| Discharge Cut-off Voltage |
2.5 V |
| Standard Charge Current |
0.5C (3000 mA) |
| Standard Discharge Current |
1C (6000 mA) |
| Approx. Weight |
≤ 75 g |
| Cell Color |
Light Purple |
Detailed Electrical Specifications
Core Electrical Characteristics
| Parameter |
Specification |
Conditions |
| Energy Density |
296 Wh/kg |
|
| Internal Impedance |
≤ 25 mΩ |
AC 1kHz |
| Charging Cut-off Current |
≥ 0.02C (120 mA) |
|
Maximum Charge Current by Temperature
| Temperature Range |
Maximum Charge Current |
| 15°C to 45°C |
0.7C (4200 mA) |
| 5°C to 15°C |
0.5C (3000 mA) |
| 0°C to 5°C |
0.1C (600 mA) |
Maximum Discharge Current by Temperature
| Temperature Range |
Maximum Discharge Current |
| 0°C to 35°C |
2C (12000 mA) |
| -20°C to 0°C |
1C (6000 mA) |
| 35°C to 45°C |
1C (6000 mA) |
| 45°C to 60°C |
0.5C (3000 mA) |
Physical Specifications
| Property |
Specification |
| Cell Diameter |
21.65 ± 0.2 mm |
| Cell Height |
70.95 ± 0.2 mm |
| Weight |
≤ 75 g |
Temperature Specifications
| Mode |
Temperature Range |
| Charge |
0°C to 45°C |
| Discharge |
-20°C to 60°C |
| Storage |
-20°C to +40°C (≤ 3 months) |
Performance Data
Discharge Efficiency at Various Rates (25°C)
| Discharge Rate |
Current |
Efficiency |
| 0.2C |
1200 mA |
100% |
| 0.5C |
3000 mA |
≥ 95% |
| 1C |
6000 mA |
≥ 93% |
| 2C |
12000 mA |
≥ 90% |
Discharge Efficiency at Various Temperatures (1C Rate)
| Temperature |
Efficiency |
Cut-off Voltage |
| 25°C |
100% |
2.5V |
| 55°C |
≥ 95% |
2.5V |
| -20°C |
≥ 70% |
2.2V |
Cycle Life
500 cycles at 0.5C charge / 1C discharge (4.2V - 2.75V) while maintaining ≥70% of initial capacity.
Storage Characteristics
- 28 days at 25°C: Residual capacity ≥85%, Recovery capacity ≥90%
- 7 days at 55°C: Residual capacity ≥85%, Recovery capacity ≥90%
Safety & Compliance
This cell is designed to meet stringent international safety standards. It has passed tests including:
- Overcharge
- Over-discharge
- Short Circuit
- Drop
- Heating (130°C)
- Seawater Immersion
- Low Pressure (11.6 kPa)
- Temperature Cycling
The cell is compliant with RoHS and relevant environmental directives for hazardous substance restrictions.
Applications
This high-capacity 21700 cell is suitable for a wide range of applications, including:
- High-drain power tools
- Light Electric Vehicles (LEVs) and e-mobility devices
- Portable medical equipment
- Professional-grade flashlights and lighting
- Backup power systems and power banks
