Test/review of Keeppower 20700 4250mAh P2070J (Black) 2019

HKJ · Sep 14, 2019

[size=+3]Keeppower 20700 4250mAh P2070J (Black) 2019[/size]

Official specifications:

Capacity min.: 4250mAh
Capacity typ.: 4050mAh
Nominal voltage: 3.70V
Charge voltage: 4.20+/-0.05V
Standard discharge cut-off voltage: 2.50V
Standard charge current: 2000mA
Charge termination current: 80mA
Max. continuous discharge current: 10A

Keeppower%2020700%204250mAh%20P2070J%20(Black)%202019-info.png

This is a protected 20700 cell with fairly good capacity

Keeppower%2020700%204250mAh%20P2070J%20(Black)%202019-Capacity.png

The two cells matches very fine and capacity drops slowly with higher current. The protection trips after some time at 10A.

Keeppower%2020700%204250mAh%20P2070J%20(Black)%202019-Temp-7.0.png

Keeppower%2020700%204250mAh%20P2070J%20(Black)%202019-Temp-10.0.png

Keeppower%2020700%204250mAh%20P2070J%20(Black)%202019-CapacityTimeHours.png

Keeppower%2020700%204250mAh%20P2070J%20(Black)%202019-CapacityTime.png

Keeppower%2020700%204250mAh%20P2070J%20(Black)%202019-Energy.png

Keeppower%2020700%204250mAh%20P2070J%20(Black)%202019-PowerLoadTime.png

Keeppower%2020700%204250mAh%20P2070J%20(Black)%202019-TripCurrent.png

Keeppower%2020700%204250mAh%20P2070J%20(Black)%202019-Charge.png

Keeppower%2020700%204250mAh%20P2070J%20%28Black%29%202019-Pulse-1.0A-10-10-2.5V-IR.png

[size=+3]Conclusion[/size]

This is a good protected cell.

[size=+3]Notes and links[/size]

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

ampdude · Sep 14, 2019

I like Keeppower, they seem like a well made brand. What are some common uses of this size cell? Are there a lot of flashlights that use it? I don't think I've heard of it before, but all types of different sizes seem to be popping up the past few years.

HKJ · Sep 14, 2019

ampdude said:
I like Keeppower, they seem like a well made brand. What are some common uses of this size cell? Are there a lot of flashlights that use it? I don't think I've heard of it before, but all types of different sizes seem to be popping up the past few years.

There are flashlights for 20/21-700 cells. The main reason to use protected cells are devices that are lacking a low voltage cut-off, with single cell LiIon flashlight this is seldom a problem because a led stop working when the voltage is low. With flashlights that uses cells in series or other devices (Both single and multi cell) there may be very good reasons to use protected cells.

Test/review of Keeppower 20700 4250mAh P2070J (Black) 2019

HKJ

Flashaholic

ampdude

Flashlight Enthusiast

HKJ

Flashaholic

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