Product Overview
The 21700 5500mAh lithium-ion rechargeable cell is a high-capacity cylindrical battery designed for applications requiring reliable power delivery across a wide temperature range. With robust performance characteristics and advanced safety features, this cell is ideal for use in high-drain devices, outdoor equipment, and low-temperature environments.
Key Electrical Parameters
| Parameter |
Specification |
Conditions |
| Nominal Capacity |
5500 mAh |
Charge: 0.5C (2750 mA), CCCV, 4.2V, 0.02C cut-off; Discharge: 0.2C (1100 mA) to 2.5V |
| Minimum Capacity |
5350 mAh |
|
| Nominal Voltage |
3.6 V |
|
| Internal Resistance |
≤ 25 mΩ |
AC Impedance, 1000 Hz |
| Charge Cut-off Voltage |
4.20 V |
|
| Discharge Cut-off Voltage |
2.5 V |
|
| Standard Charge Current |
0.5C (2750 mA) |
|
| Standard Discharge Current |
1C (5500 mA) |
|
| Max. Continuous Discharge Current |
2C (11000 mA) |
35°C > T ≥ 0°C |
| Operating Temperature |
Charge: 0°C to 45°C; Discharge: -40°C to 60°C |
|
| Dimensions |
21.65 ± 0.2 mm (Diameter), 70.95 ± 0.2 mm (Height) |
|
| Weight |
≤ 73 g |
|
Performance Characteristics
Discharge Efficiency
| Rate |
Current |
Efficiency |
| 0.2C |
1100 mA |
100% |
| 0.5C |
2750 mA |
≥ 95% |
| 1C |
5500 mA |
≥ 93% |
| 2C |
11000 mA |
≥ 90% |
Cycle Life
- ≥ 70% capacity retention after 600 cycles (0.5C charge / 1C discharge, 4.2V–2.75V)
Low-Temperature Performance
| Temperature |
Discharge Efficiency |
| -20°C (1C) |
≥ 80% |
| -30°C (0.5C) |
≥ 75% |
| -40°C (0.2C) |
≥ 60% |
Safety Features
- Overcharge, over-discharge, short-circuit, and drop protection
- Stable performance under extreme environmental conditions
- Complies with standard lithium-ion safety testing protocols
Applications
- High-drain portable devices
- Outdoor and low-temperature equipment
- Power banks and energy storage systems
- Medical and industrial devices
Notes
- All tests performed at 25±2°C and ≤ 85% RH unless otherwise specified.
- Discharge efficiency calculated relative to 0.2C discharge capacity.
