Test/Review of Keeppower 18650 3200mAh (Black) 2014

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HKJ
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Test/Review of Keeppower 18650 3200mAh (Black) 2014

Keeppower 18650 3200mAh (Black) 2014

DSC_4824

Official specifications:

  • Min Capacity: 3100mAh
  • Typical Capacity: 3200mAh
  • Normal Voltage: 3.7V
  • Quality Lithium Ion rechargeable cell made in Korea
  • Maximum capacity and reliability
  • Size: L:69.00mm*D:18.50mm
  • Cell made in Korea
  • 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
  • Over 500 times of charge and discharge cycle life.



Keeppower%2018650%203200mAh%20(Black)%204.35V%202014-info

This is the highest capacity cell with 4.35 volt at the current time, but due to the protection the mAh is to low.

DSC_4823

DSC_4825 DSC_4826

DSC_4827
DSC_4828


Keeppower%2018650%203200mAh%20(Black)%204.35V%202014-Capacity

The discharge curves does not looke very nice, but that is not due to any problem with the cell, it is because the protection has intefered with the charging.
It can also be seen that the protection trips after some time at 7A.

Keeppower%2018650%203200mAh%20(Black)%204.35V%202014-CapacityTimeHours

Keeppower%2018650%203200mAh%20(Black)%204.35V%202014-CapacityTime

Keeppower%2018650%203200mAh%20(Black)%204.35V%202014-Energy

Keeppower%2018650%203200mAh%20(Black)%204.35V%202014-PowerLoadTime

Keeppower%2018650%203200mAh%20(Black)%204.35V%202014-TripCurrent

Keeppower%2018650%203200mAh%20(Black)%204.35V%202014-Charge

Here it is obvious that one cell stops charging, before the other and probably neither of them is fully charged (The voltage drop when the charge current stops looks to large).



Test with 4.3 volt charging

Reducing the charge voltage slightly gets around the problem with the proction.

Keeppower%2018650%203200mAh%20(Black)%204.30V%202014-info

Keeppower%2018650%203200mAh%20(Black)%204.30V%202014-Capacity

The difference between 4.3 and 4.35 volt charging is minimal. This time the curves look fine.

Keeppower%2018650%203200mAh%20(Black)%204.30V%202014-CapacityTimeHours

Keeppower%2018650%203200mAh%20(Black)%204.30V%202014-CapacityTime

Keeppower%2018650%203200mAh%20(Black)%204.30V%202014-Energy

Keeppower%2018650%203200mAh%20(Black)%204.30V%202014-PowerLoadTime

Keeppower%2018650%203200mAh%20(Black)%204.30V%202014-TripCurrent

Keeppower%2018650%203200mAh%20(Black)%204.30V%202014-Charge

Both cells is fully charged here.



Test with 4.2 volt charging

Keeppower%2018650%203200mAh%20(Black)%202014-info

Using a normal 4.2 volt LiIon charger does cost capacity, about 250mAh compared to 4.3 volt.

Keeppower%2018650%203200mAh%20(Black)%202014-Capacity

Keeppower%2018650%203200mAh%20(Black)%202014-CapacityTimeHours

Keeppower%2018650%203200mAh%20(Black)%202014-CapacityTime

Keeppower%2018650%203200mAh%20(Black)%202014-Energy

Keeppower%2018650%203200mAh%20(Black)%202014-PowerLoadTime

Keeppower%2018650%203200mAh%20(Black)%202014-TripCurrent

Keeppower%2018650%203200mAh%20(Black)%202014-Charge



Conclusion

Being based on LG cells, it is good batteries, but with the slightly low protection voltage they do not give the full benefit of the higher 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

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

Edited by: HKJ on 03/18/2014 - 11:36
sesgum
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Thank you for the great review!

HKJ
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B25364 wrote:
Where can these LG cells be found without the protection ?

Try a google search for the cell type number, I got a match on Fasttech.

B25364 wrote:
Have you reviewed the unprotected cell ?

Not yet.

B25364 wrote:
LG is Korean But DLG is Chinese ? AFAIK

Correct, that is the reason it says "Cell made in Korea" on the label.

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

HKJ
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B25364 wrote:
Did they change it just because of your review?

Definitely not due to my review, but maybe the comments or they are not using a Seiko chip.

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

Lithium
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It appears you reviewed the older version of this cell, new one says it is now using a pcb with a higher voltage protection, can you confirm?

HKJ
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Lithium wrote:
It appears you reviewed the older version of this cell, new one says it is now using a pcb with a higher voltage protection, can you confirm?

I do not know if they have changed anything since I received the cell in January.

If they send me a new battery with a higher protection voltage I will, of course, test it.

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

Lithium
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In fact While looking for this cell I came across two cell with different protection circuit stated by seller:

http://www.akkuteile.de/keeppower-18650-3200mah-3-7v-li-ion-akku-geschue...

http://www.akkuteile.de/lithium-ionen-akkus/18650/keeppower/keeppower-18...

It appears you reviewed the second one