4700mAh 3.7V Great Power 21700 Battery
Great Power 21700 Battery
The Great Power 21700 Battery comes up with a nominal capacity of 4700mAh, the voltage of 3.7V. This is an absolutely excellent cell for anyone seeking high performance 21700 cells.
HIGHLIGHTS OF Great Power 21700:
- Nominal Capacity: 4700mAh
- Nominal Voltage:3.7V
- Standard Charge Current:2400mA
- Standard Charge Voltage: 4.2V
- Internal Impedance: ≤50mΩ
APPEARANCE
There shall be no such defects as deep scratch, crack, rust, discoloration or leakage, which may adversely affect the commercial value of the cell.
Diameter :21.8±0.20mm
Diameter is defined as the largest data value measured on the “A” area of a cylindrical cell.
Height :70.5±0.50mm
-Nominal Specification of Great Power 21700 Battery-
| ltem | Specifications | Remark | |
| Nominal Capacity | 4700mAh | 0.2C Standard discharge | |
| Minimum Capacity | 4600mAh | ||
| Nominal Voltage | 3.7V | Mean Operation Voltage | |
| Delivery voltage | 3.6V | Within 10 days from Factory | |
| Charge Voltage | 4.2V±0.03V | By standard charge method | |
| Standard charging method | 0.2C constant current,4.2V constantvoltage charge to 4.2V,continue chargingtill current decline to ≤0.01C | - | |
| Charge current | 0.2C | 960mA | Standard charge,charge time about7h(Ref) |
| 0.5C | 2400mA | Rapid Charge,charge time about:3.5h | |
| Standard discharging method | 0.2C constant current discharge to2.75V, | - | |
| Cell Internal Impedance | ≤50mΩ | Internal resistance measured at AC1KHz after 50% charge | |
| Maximum charge current | 0.5C | 2400mA | For continuous charging mod |
| Max. Discharge current | 1.5C | 7200mA | Max. Discharge mod |
| Operation Temperature and relative humidity Range | Charge | 10~45℃ 60±25%R.H. | Charge at a very low temperature such as blew 0℃,will be get a lower capacity and reduce cycle life of the battery |
| humidity Range | Discharge | -20~60℃60±25%R.H. | |
| Storage temperature for a long time | -20~25℃ 60±25%R.H. | Do not storage exceed half year. Must charge once when storage for half year. must charge the battery which with protect circuit when storage for three months. | |
–Cell Electrical characteristics–
| Items | Test Method and Condition | Criteria | |
| Rated Capacity at 0.2C(Min.) | After standard charge, the capacity shall be measured on 0.2C discharge till the voltage | ≥4700mAh | ≥100% |
| Cycle Life | Charging and discharging battery as blew conditions 0.2C standard charge to 4.2V end-off 0.2C standard discharge to 2.75V cut-off Continuous charge and discharge for 500 cycles ,the capacity will be measure after the 500th cycle |
≥80% of initial capacity | |
| Capacity retention | The battery to be charge in accordance with standard charge condition at 20~25℃,then storage the battery at an ambient temperature 20~25℃ for 28 days.Measure the capacity after 28 days with 0.2C at 20~25℃ as retention capacity | Retention Capacity≥85% | |
| Temperature Dependence of discharge capacity | Cells shall be charged per 3.3.1 and discharged @0.2 C5A to 3.0 volts. Except to be discharged at temperatures per Table 3. Cells shall be stored for 3 hours at the test temperature prior to discharging and then shall be discharged at the test temperature. The capacity of a cell at each temperature shall be compared to the capacity achieved at 25 ºC and the percentage shall be calculated. | Each cell shall meet or exceed the requirements of Table 3 | |
Warning:
1). Do not disassemble, dispose of in fire, heat or short circuit.
2).Do not insert batteries with the(+)and(-)reversed.
3). Do not mix fresh batteries with used batteries.
4).Do not submerge the battery in water
Storage Measures For Daily Lithium Battery Users
1. For Lithium-ion batteries which need to be stored for a long time and not used, they should be kept in a state of 50%-60% charge. They should be recharged every 3 months and recharged every half a year.
2. Attention should be paid to moisture-proof and moisture-proof, to prevent squeezing, collision, etc., to avoid battery damage.
3. It is forbidden to use or place the battery at high temperatures (in hot sunlight or in very hot cars), otherwise it may cause the battery to overheat, catch fire or fail in function, and shorten its life.
4. It is forbidden to store in places with strong static electricity and strong magnetic fields, otherwise it will easily destroy the battery safety protection device and bring unsafe hidden dangers.
5. If the battery emits an odor, fever, discoloration, deformation, or any abnormality during use, storage, or charging, immediately remove the battery from the device or charger and disable it.
How to Custom 21700 Battery Pack
We have the unique ability to develop custom 21700 battery pack to fit your needs. Our expert team of chemists, engineers, and manufacturers who use proven chemistry and production methods that will get from spec to production fast. Slim, flexible, more powerful.
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