Golisi IMR21700 3750mAh S35 (Black)



Official specifications:
  • Size: 21 x 70mm
  • Model: 21700
  • Capacity: 3750mAh
  • Constant Current: 40A
  • Nominal Voltage: 3.7V
  • Charging cut-off voltage: 4.20±0.05V
  • Internal resistance: 30mOhm
  • Standard charging current: cc/cv(<=3A)
  • Cycle times: >800
  • Operate temperature: Charging: 0°C ~ 45°C), Discharging: -20°C ~ 60°C




A high current with fairly high capacity 21700 cell.










The two cell has different capacity, but both has fairly constant capacity even at high load. One cell is close to stated capacity at low low, the other is a bit low.





Temperature is acceptable at 20A



But at 20A I had to stop the discharge due to heat.















Conclusion

The current and capacity is good, but I do not like that the cells have different capacity.



Notes and links

The battery was supplied by Golisi 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
Compare to 18650 and other batteries