Keeppower 21700 5000mAh P2150K (Black) 2019

Official specifications:
  • Capacity typ.: 4900mAh
  • Capacity min.: 4750mAh
  • Nominal voltage: 3.70V
  • Charge voltage: 4.20+/-0.05V
  • Standard discharge cut-off voltage: 2.50V
  • Standard charge current: 2450mA
  • Charge termination current: 100mA
  • Max. continuous discharge current: 10A

This is a high capacity 21700 cell with added protection circuit.

The discharge curves for the two cells matches very fine, the protection trips after some time with 10A load.


This is a very good quality cell with about maximum capacity for this size. The protection adds a few safeguards to the cell.

Notes and links

The batteries was supplied by Keeppower 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