Keeppower 16650 2500mAh (Black) 2015

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Official specifications:
Keeppower%2016650%202500mAh%20(Black)%202015%204.35V-info

This is a slimline version of the xx650 battery, it can usual replace two CR123 cells. It has a lower voltage, but more capacity.

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Keeppower%2016650%202500mAh%20(Black)%202015%204.35V-Capacity

The discharge curves looks very good, but the capacity is rather low. The low capacity was expected, the problem is the protection circuit, it terminates before the battery is full!

Keeppower%2016650%202500mAh%20(Black)%202015%204.35V-CapacityTimeHours

Keeppower%2016650%202500mAh%20(Black)%202015%204.35V-CapacityTime

Keeppower%2016650%202500mAh%20(Black)%202015%204.35V-Energy

Keeppower%2016650%202500mAh%20(Black)%202015%204.35V-PowerLoadTime

Keeppower%2016650%202500mAh%20(Black)%202015%204.35V-TripCurrent

Keeppower%2016650%202500mAh%20(Black)%202015%204.35V-Charge

Look at the voltage drop when charging terminates, it is way to large because of the protection circuit.



Charging with 4.30 volt

Keeppower%2016650%202500mAh%20(Black)%202015%204.3V-info

Lets try a slightly lower charge voltage.

Keeppower%2016650%202500mAh%20(Black)%202015%204.3V-Capacity

The batteries has more capacity at this voltage and the discharge curves looks good.

Keeppower%2016650%202500mAh%20(Black)%202015%204.3V-CapacityTimeHours

Keeppower%2016650%202500mAh%20(Black)%202015%204.3V-CapacityTime

Keeppower%2016650%202500mAh%20(Black)%202015%204.3V-Energy

Keeppower%2016650%202500mAh%20(Black)%202015%204.3V-PowerLoadTime

Keeppower%2016650%202500mAh%20(Black)%202015%204.3V-TripCurrent

Keeppower%2016650%202500mAh%20(Black)%202015%204.3V-Charge

No big drop when charging terminates, this time the protection did not trigger.



Charging with 4.20 volt

Keeppower%2016650%202500mAh%20(Black)%202015-info

What about using a normal LiIon charger?

Keeppower%2016650%202500mAh%20(Black)%202015-Capacity

It is about 200mAh less than 4.30V charging.

Keeppower%2016650%202500mAh%20(Black)%202015-CapacityTimeHours

Keeppower%2016650%202500mAh%20(Black)%202015-CapacityTime

Keeppower%2016650%202500mAh%20(Black)%202015-Energy

Keeppower%2016650%202500mAh%20(Black)%202015-PowerLoadTime

Keeppower%2016650%202500mAh%20(Black)%202015-TripCurrent

Keeppower%2016650%202500mAh%20(Black)%202015-Charge



Conclusion

It would have been nice with a protection circuit for 4.35V, but even with the capacity loss the battery is a good and a very good substitute for CR123 in lights that can handle the lower voltage.



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
Compare to 18650 and other batteries