Product Overview
The 21700-5000mAh lithium-ion rechargeable cell is a high-capacity cylindrical battery designed for applications requiring reliable power delivery across a wide temperature range. With a nominal voltage of 3.6V and robust low-temperature performance, this cell is suitable for use in demanding environments.
Electrical Specifications
| Parameter |
Specification |
| Nominal Capacity |
5000mAh |
| Minimum Capacity |
4950mAh |
| Energy Density |
253Wh/kg |
| Nominal Voltage |
3.6V |
| Internal Resistance |
≤25mΩ (AC Impedance, 1000 Hz) |
| Charge Cut-off Voltage |
4.20V |
| Discharge Cut-off Voltage |
2.50V |
| Standard Charge Current |
0.5C (2500mA) |
| Standard Discharge Current |
1C (5000mA) |
| Operating Temperature (Charge) |
0°C to 45°C |
| Operating Temperature (Discharge) |
-40°C to 60°C |
| Dimensions (Diameter × Height) |
21.65±0.2mm × 70.95±0.2mm |
| Weight |
≤73g |
Performance Characteristics
Discharge Efficiency at Various Rates (25°C)
| Rate |
Current |
Discharge Efficiency |
| 0.2C |
1000mA |
100% |
| 0.5C |
2500mA |
≥95% |
| 1C |
5000mA |
≥93% |
| 2C |
10000mA |
≥90% |
Low-Temperature Discharge Performance
| Temperature |
Discharge Current |
Cut-off Voltage |
Efficiency |
| -20°C |
1C (5000mA) |
2.0V |
≥80% |
| -30°C |
0.5C (2500mA) |
2.0V |
≥75% |
| -40°C |
0.2C (1000mA) |
2.0V |
≥60% |
Cycle Life and Storage
- Cycle Life: ≥70% capacity retention after 800 cycles (0.5C charge / 1C discharge, 4.20V–2.75V)
- Storage (25°C, 28 days): Residual capacity ≥85%, recovery capacity ≥90%
- Storage (55°C, 7 days): Residual capacity ≥85%, recovery capacity ≥90%
Safety Features
- Overcharge protection
- Over-discharge protection
- Short-circuit protection
- Thermal stability testing
- Compliant with international safety standards
Applications
- Portable medical devices
- Low-temperature industrial equipment
- Outdoor and backup power systems
- High-drain consumer electronics
Notes
- Avoid charging below 0°C or above 45°C
- Do not discharge below 2.5V to prevent cell damage
- Store in a dry environment (0–50% RH) at 10–35% state of charge (SOC) for long-term storage
