Test / Review: Keeppower 18650 2800mAh (Black)

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HKJ
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Test / Review: Keeppower 18650 2800mAh (Black)

Keeppower 18650 2800mAh (Black)

DSC_1529

Official specifications:

  • 18650 280mAh Protected Rechargeable Battery
  • Min Capacity: 2700mAh
  • Typical Capacity: 2800mAh
  • Normal Voltage: 3.7V
  • Quality Lithium Ion rechargeable cell
  • In Built Safety Circuitry
  • Maximum capacity and reliability
  • High Discharge Rate (Max 2C)
  • Protection Circuit (Against overcharge, over discharge, over current and short-circuit.)
  • 4.2 volts max voltage and 3.6-3.7 volts nominal voltage


Keeppower%2018650%202800mAh%20(Black)%204.3V-info

This battery is not the usual 4.2 volt charging, but needs 4.3 volt charging, i.e. a special charger must be used (Some hobby chargers can be adjusted for it).

DSC_1528
DSC_1530 DSC_1531
DSC_1532
DSC_1533

Keeppower%2018650%202800mAh%20(Black)%204.3V-Capacity

The capacity is slightly below 2800mAh, but very constant at different loads. The battery has a high voltage, but not higher than the best 4.2 volt batteries. Where it is better is runtime at high voltage.

Keeppower%2018650%202800mAh%20(Black)%204.3V-CapacityTimeHours

Keeppower%2018650%202800mAh%20(Black)%204.3V-CapacityTime

Keeppower%2018650%202800mAh%20(Black)%204.3V-Energy

Keeppower%2018650%202800mAh%20(Black)%204.3V-PowerLoadTime

Keeppower%2018650%202800mAh%20(Black)%204.3V-TripCurrent

Keeppower%2018650%202800mAh%20(Black)%204.3V-Charge



Test with 4.2 volt charging

It is possible and perfectly safe to use this battery with 4.2 volt, but it will have less capacity.

Keeppower%2018650%202800mAh%20(Black)-info

When only charging to 4.2 volt the battery looses about 200mAh in capacity.

Keeppower%2018650%202800mAh%20(Black)-Capacity

Keeppower%2018650%202800mAh%20(Black)-CapacityTimeHours

Keeppower%2018650%202800mAh%20(Black)-CapacityTime

Keeppower%2018650%202800mAh%20(Black)-Energy

Keeppower%2018650%202800mAh%20(Black)-PowerLoadTime

Keeppower%2018650%202800mAh%20(Black)-TripCurrent

Keeppower%2018650%202800mAh%20(Black)-Charge



Conclusion

That battery uses a good cell and does what is supposed to do, this makes it a very good battery.
But the requirement for a special charger to get the full benefit of the battery, does reduce the usefulness of it. Using it with a 4.2 volt charger negates any benefit of the higher voltage and capacity.



Notes and links

Keeppower is a OEM manufacturer, i.e. many of the batteries they produce is sold with other names on them.

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

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

Edited by: sb56637 on 08/26/2014 - 17:46
Chicago X
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Excellent and thorough review, as usual.

 

Are there any non-hobby chargers of which you're aware that can muster the 4.35V required for max capacity ?

 

Thanks again for the review.

http://wardogsmakingithome.org/index.html

War Dogs, Making it Home - Rescue Dogs for Returning Vets

HKJ
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Chicago X wrote:
Are there any non-hobby chargers of which you're aware that can muster the 4.35V required for max capacity ?

 

I got this one some time ago.

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

Chicago X
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HKJ wrote:
 

I got this one some time ago.

Thanks very much - I had completely forgotten about CP.

http://wardogsmakingithome.org/index.html

War Dogs, Making it Home - Rescue Dogs for Returning Vets

CheapThrills
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Just used that great battery comparator on Your site, HKJ.

Realized, that these 18650ICR cells would be a very good replacement for my current favorites, the Xtars.
These seem to have also a “steep knee” in discharge graph, yet they can hold it a bit higher and a bit longer.