21700 Lithium Battery 4000mAh
- Model : 21700 – 4000mah
- Size : 21700
- Positive Terminal : Flat Top
- Capacity Range : 4050-4080 mah
- Voltage : 3.7 V
- Internal Resistance:≤ 23mΩ
- Discharge cut-off Voltage : 2.75V
- Protected : Yes
- Rechargeable : Yes
- Approx. Dimensions : 21.7mm x 70.5 mm
- Approx. Weight : 695 g / 10 pcs
- Country of Origin : China
Specification
Model | DL21700-4000mAh | Internal Resistance(Max, at 1000Hz.) | ≤ 23mΩ |
Shell Material | Nickeled Steel | Standard Charge Methods(CC/CV) | 0.2 C5A X 6.5hrs |
Nominal capacity(0.5C5A) | 4000mAh | High Speed Charge Methods(CC/CV) | 0.5 C5A X 2.5hrs. |
Nominal Voltage | 3.7V | Charge Operation Temperature | 0°C 〜 45°C |
Max Charge Voltage | 4.2V | 32°F〜113°F | |
Discharge cut-off voltage | 2.75V | Discharge Operation Temperature | -20°C 〜55°C |
Max charge current | 0.5C | -4°F 〜 140°F | |
Discharge Current(continuous) | 2C | Storage Operation Temperature | -20 °C 〜45 °C |
Max Discharge Current | 3C | -4°F〜113°F | |
Battery Diameter(Shell) | 21.7 ± 0.3 mm | Cycle life | Capacity ≥ 80% of Nominal capacity |
Battery High(Shell) | 70.5 ± 0.3mm | Testing Method | Measure the initial state and initial capacity of the battery, and |
Battery Weight(Approx.) | 69.5 g | the final state of the battery after 300 cycles of 0.5C / 0.5 C. |