BAK N21700CGP – Energy 21700 Cell
Premium energy-class 21700 from BAK Battery — one of China’s leading battery manufacturers. Grade A quality with strong energy density and reliable cycle life.
Technical Specifications
| Specification | Value |
|---|---|
| Format | 21700 |
| Chemistry | NMC Hi-Ni |
| Nominal Voltage | 3.6V |
| Charge Voltage | 4.2V |
| Discharge Cutoff | 2.5V |
| Positive Terminal | Flat Top |
Safety Warning
Unprotected cell. Always use with a BMS. Never short-circuit or overcharge. Keep away from fire and extreme heat. Not for use in e-cigarettes or similar devices.
Cell Specification
| Item | Specification and comments |
|---|---|
| Rated capacity | 5000mAh – standard charge and 0.2C discharge to 2.5V at 25°C |
| Typical capacity | 5100mAh – measured under standard charge / 0.2C discharge conditions |
| Nominal voltage | 3.6V |
| Rated energy | 18.0Wh |
| Typical energy | 18.36Wh |
| Limited charging voltage (Ucl) | 4.20V |
| End of discharge voltage (Ude) | 2.50V |
| Upper limited charging voltage (Uup) | 4.25V |
| Discharge cut‑off voltage (Udo) | 2.00V |
| Standard charging current (Icr) | 0.5C (2500mA) |
| Standard discharging current (Idr) | 0.2C (1000mA) |
| Maximum charging current (Icm) | 1C (5000mA, 25°C, not for cycle life) |
| Maximum discharging current (Idm) | 3C (15000mA, 25°C, not for cycle life) |
| Upper limited charging temperature (Tcm) | 45°C |
| Lower limited charging temperature (Tcl) | 0°C |
| Upper limited discharging temperature (Tdm) | 60°C |
| Lower limited discharging temperature (Tdl) | -20°C |
| Allowable maximum surface temperature (Tmax) | Charge: 55°C (recommended ≤45°C); Discharge: 70°C (recommended ≤60°C) |
| Storage temperature | 1 year: -20~25°C; 3 months: -20~45°C; 1 month: -20~60°C |
| Humidity range | 0~60% RH (non‑condensing) |
| Internal resistance | ≤25mΩ (AC impedance, 1000Hz) |
| Cell weight | ≤72g |
| Cell dimensions | Diameter: 21.70mm max; Height: 70.80mm max (with tube) |
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