Lishen 21700 4000mAh LR2170LA (Purple)
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Official specifications:
- Standard discharge capacity: 4000mAh (0.8A charge/discharge)
- Standard minimum discharge capacity: 3900mAh
- Rated discharge capacity: 3900mAh (6A charge / 10A discharge)
- Rated minimum discharge capacity: 3800mAh
- Nominal voltage: 3.6V
- Standard charge: CCCV 2A, 4.20V, 200mA cut-off
- Rapid charge: CCCV 6A, 4.20V, 100mA cut-off
- Max. continuous discharge: 45A with cut-off at 80°C surface temperature
- Discharge cut-off voltage: 2.5V
- Cycle life: 300 cycles to 80% (0.8A charge / 4A discharge)
- Cycle life: 300 cycles to 60% (6A charge / 35A discharge)
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This is a high current 21700 cell.
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The two cells match fairly well and maintain fairly stable capacity even at high loads, but the cell get hot at 30A (My holder melted).
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/Lishen%2021700%204000mAh%20LR2170LA%20(Purple)-Temp-30.0.png)
/Lishen%2021700%204000mAh%20LR2170LA%20(Purple)-CapacityTimeHours.png)
/Lishen%2021700%204000mAh%20LR2170LA%20(Purple)-CapacityTime.png)
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/Lishen%2021700%204000mAh%20LR2170LA%20(Purple)-TripCurrent.png)
/Lishen%2021700%204000mAh%20LR2170LA%20(Purple)-Charge.png)
Conclusion
The cells looks good, but I sort of doubts the continuous discharge rate of 45A, it will probably always be stopped on the 80°C cut-off before the cell is empty.
Notes and links
The batteries was supplied by a reader for review.
How is the test done and how to read the charts
How is a protected LiIon battery constructed
More about button top and flat top batteries
Graphical comparison to 18650 and other batteries
Table with all tested LiIon batteries