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

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

Keeppower 18650 3500mAh P1835J (Black) 2019
DSC_6834
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

Keeppower%2018650%203500mAh%20P1835J%20(Black)%202019-info
This is a 3500mAh protected 18650 battery from Keeppower.
DSC_6833
DSC_6835 DSC_6836
DSC_6837
DSC_6838
Keeppower%2018650%203500mAh%20P1835J%20(Black)%202019-Capacity
The two cells match very nicely. At continuous 7A the protection trips before the batteries are empty.
Keeppower%2018650%203500mAh%20P1835J%20(Black)%202019-Temp-5.0
Keeppower%2018650%203500mAh%20P1835J%20(Black)%202019-Temp-7.0
Keeppower%2018650%203500mAh%20P1835J%20(Black)%202019-CapacityTimeHours
Keeppower%2018650%203500mAh%20P1835J%20(Black)%202019-CapacityTime
Keeppower%2018650%203500mAh%20P1835J%20(Black)%202019-Energy
Keeppower%2018650%203500mAh%20P1835J%20(Black)%202019-PowerLoadTime
Keeppower%2018650%203500mAh%20P1835J%20(Black)%202019-TripCurrent
Keeppower%2018650%203500mAh%20P1835J%20(Black)%202019-Charge
Keeppower%2018650%203500mAh%20P1835J%20%28Black%29%202019-Pulse-1.0A-10-10-2.8V-IR
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

My website with reviews of many chargers and batteries (More than 1000): https://lygte-info.dk/

MascaratumB
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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?

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HKJ
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MascaratumB wrote:
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?

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

My website with reviews of many chargers and batteries (More than 1000): https://lygte-info.dk/

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

SubLGT
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This same model, #P1835J, was tested back in 2015:
http://budgetlightforum.com/node/42197

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.