Test/Review of Keeppower 18650 3100mAh (Black)

HKJ

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[size=+3]Keeppower 18650 3100mAh (Black)[/size]

DSC_1549.jpg


Official specifications:
  • 18650 3100mAh Protected Rechargeable Battery
  • Min Capacity: 2900mAh
  • Typical Capacity: 3100mAh
  • Normal Voltage: 3.6V
  • 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%203100mAh%20(Black)-info.png


The cell used can be discharged down to 2.5 volt, in my test I only discharges to 2.8 volt, i.e. I do not measure the full capacity. But then, not all lights will be able to use the full capacity.

DSC_1378.jpg


DSC_1550.jpg
DSC_1384.jpg

DSC_1381.jpg

DSC_1382.jpg


Keeppower%2018650%203100mAh%20(Black)-Capacity.png


Each chart has curves for two batteries, but these batteries are nearly identical in performance and the curves are on top of each other.

Keeppower%2018650%203100mAh%20(Black)-CapacityTimeHours.png


Keeppower%2018650%203100mAh%20(Black)-CapacityTime.png


Keeppower%2018650%203100mAh%20(Black)-Energy.png


Keeppower%2018650%203100mAh%20(Black)-PowerLoadTime.png


Keeppower%2018650%203100mAh%20(Black)-TripCurrent.png


Keeppower%2018650%203100mAh%20(Black)-Charge.png




[size=+3]Conclusion[/size]

This battery uses a good cell, this secures many things:
  • The batteries does match in capacity, i.e. they can be used in series.
  • The battery is very safe.
  • The battery has the specified capacity.


All in all a very good battery.



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

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
 

zer0ne

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I do not know, but I believe that there is a reason I was asked to test their batteries, i.e. keep looking, something will probably pop up soon.

They are OEM maker.....I don't think they are interested in small quantity for hobbyist. :) Hopefully we can have more choices.
 

hellokitty[hk]

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Do you have plans to test the Orbtronic 3100mAh 18650? It looks like the cheapest 3100mAh battery at $13.00 and free shipping.
 

zenbeam

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Thanks for the great review! I know many of us are in search of good pricing in batteries, but are fully prepared to pay the premium for "known quality and safety" and I don't disagree with that. But, these batteries seems like a great value and a contender with the known brands for quality and safety. Of course, being Panasonic based can't hurt. So I very recently ordered 2 pair of the Keeppower 3100mAh 18650's featured here.

I googled them first and found another forum post stating that on ebay, find the seller asking $23 per pair (free shipping - but comes from China) and make offer of $21 per pair and the offer will be accepted. I did exactly that and am now just waiting. Should get mine between 6/12 and 6/18. That seller is doingoutdoor - is very high rated seller, so I don't feel like I took too much of a gamble.
 
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tobrien

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Thanks for the great review! I know many of us are in search of good pricing in batteries, but are fully prepared to pay the premium for "known quality and safety" and I don't disagree with that. But, these batteries seems like a great value and a contender with the known brands for quality and safety. Of course, being Panasonic based can't hurt. So I very recently ordered 2 pair of the Keeppower 3100mAh 18650's featured here.

I googled them first and found another forum post stating that on ebay, find the seller asking $23 per pair (free shipping - but comes from China) and make offer of $21 per pair and the offer will be accepted. I did exactly that and am now just waiting. Should get mine between 6/12 and 6/18. That seller is doingoutdoor - is very high rated seller, so I don't feel like I took too much of a gamble.
thanks for the info bud! i'll have to grab some
 

HighlanderNorth

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Yes, Orbtronic will send some batteries to me (or maybe they already has).


I bought 4 Orbtronics 2900mah 18650 batts per your review a few weeks ago, and I have not used them at all yet, as I already have other 18650's in my 18650 lights, but I assume they will be good.

I will eventually try these too.
 
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Jedgar

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I just got 10 of these from the doingoutdoor seller on ebay I paid 85 But ended up having them send me a paypal invoice to get this price.
They just got here this evening and I dont think you can beat the price for a heck of a deal on good batteries.
Just fyi
Josh
 

tobrien

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I just got 10 of these from the doingoutdoor seller on ebay I paid 85 But ended up having them send me a paypal invoice to get this price.
They just got here this evening and I dont think you can beat the price for a heck of a deal on good batteries.
Just fyi
Josh
Very good deal. I snagged four for $40 total. Four cells that is, not pairs.
 

zenbeam

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Very good deal. I snagged four for $40 total. Four cells that is, not pairs.

I thought about offering 20 per pair but chickened out - didn't want to delay it any longer than necessary - considering it's already coming from China. So heed this notice for further orders folks - offer 20 per pair if ordering 2 pair. ;)
 

tobrien

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I thought about offering 20 per pair but chickened out - didn't want to delay it any longer than necessary - considering it's already coming from China. So heed this notice for further orders folks - offer 20 per pair if ordering 2 pair. ;)

you raise a good point, but i don't need it insanely urgently lol
 

Dubois

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I thought about offering 20 per pair but chickened out So heed this notice for further orders folks - offer 20 per pair if ordering 2 pair. ;)

I made a slightly lower bid, but I was happy paying $42 for 4, and they arrived in the UK in 10 days, registered shipping.
 

zenbeam

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@ HKJ -

What are the dimensions of these batteries?

I've never owned 3100mAh 18650's yet, but I've read that they might have a problem actually fitting certain lights?
 
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