Test/review of Keeppower 18650 3500mAh P1835J (Black) 2019

Batteries and Chargers Rechargeable Batteries
1

Keeppower 18650 3500mAh P1835J (Black) 2019







Official specifications:

  • Capacity min.: 3350mAh

  • Capacity typ.: 3500mAh

  • Nominal voltage: 3.70V

  • Charge voltage: 4.20+/-0.05V

  • Standard discharge cut-off voltage: 2.50V

  • Standard charge current: 1500mA

  • Charge termination current: 50mA

  • Standard discharge current: 3400mA

  • Max. continuous discharge current: 8A



This is a 3500mAh protected 18650 battery from Keeppower.










The two cells match very nicely. At continuous 7A the protection trips before the batteries are empty.





















Conclusion

This is very good quality protected batteries and one of the highest capacity 18650 batteries available.



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
2

Thanks for the review HKJ! I went to check you comparator and comparing this KP with the Samsung INR18650-35E 3500mAh (Pink), the Samsung still beats this one in terms of capacity and drain (low and high Amps).
Would you considerer it “the best” 18650 regarding to capacity? Or will the Sanyo “beat” it?

3

The Samsung will have higher voltage when drawing current, because it is unprotected.
The cells are very similar, at least when new.

4

Thanks HKJ! Your work is very appreciated. Looks like another solid offering from KeepPower.

5

This same model, #P1835J, was tested back in 2015:

The latest version handily outperforms the 2015 version, as seen in the 7A discharge curve. I don’t know what cell the 2015 version was using, but the current version of P1835J appears to have discharge curves very similar to the Sanyo NCR18650GA. The Samsung 35E curves also look similar, but I think the GA discharge curves are a slightly better match.

6

The earlier versions had the year printed on them how do I know what version I have if the year is not printed on them now thanks