Test/Review of Keeppower IMR26650 5200mAh (Black) 2014

Batteries and Chargers Rechargeable Batteries
1

Keeppower IMR26650 5200mAh (Black) 2014



Official specifications:

  • Min Capacity: 5100mAh
  • Typical Capacity: 5200mAh
  • Type: Li-Mn
  • Normal Voltage: 3.7V
  • Quality Lithium Ion rechargeable cell
  • Maximum Capacity and Reliability
  • Ultra Discharge Current: 20A
  • 4.2 volts max voltage and 3.6-3.7 volts nominal voltage
  • Flat top: Yes
  • Dimension: (D)26.50mm*(H)67.000mm
  • Weight: Max. 95.0g




This is a high capacity unprotected 26650, that is supposed to deliver 30A. It does not do that.










There is a fairly good tracking between the cell, but they do not deliver 30A, they are more in the 10A to 15A range.















Conclusion

The cells works fine as unprotected high capacity cell, but they are not really super high current cells.



Notes and links

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
Compare to 26650 and other larger batteries

2

Thanks. So many great cells coming out these days.

Do you think these are the same cells as the Protected KP 5200mAh cells you reviewed?

Very similar performance and graph, just with more voltage sag on the protected cells, as would be expected.

3

The 200mA curve is virtual identical, this makes it very likely that it is the same cell.

4

So as long as you’re drawing less than 10A, this will give better results than the KP 4200mah?

5

Depends, the 4200mAh has higher voltage at any current, but the 5200mAh has more capacity up to 10A.

I.e. the question is: How much voltage do you need.

6

My lights are about evenly divided 18650/26650. Over the years 18650 has been moving forward nicely with quality cells and improvements. 26650 just sat there with only a few improvements. King Kong gave us better capacity/load ability in one cell. Now Keeppower’s 5200 capacity is replacing most of my 26650 cells. Only one high amp triple XM-L2 26650 in the whole collection and it seems to only draw 9.6 amps. Realistically speaking so few lights need more than 5 amps per cell, so this is my #1 battery to go with. I would like to know if the high amp 4200 cell is actually made by only one manufacturer. I’ve seen King Kong, Trustfire, Enerpower, Kinoko wrappers.

And once again thanks for the great review.

7

The King Kongs are not of the same quality as the new KP 4200mah in terms of very high current draw.