Test / Review: Keeppower 18650 3100mAh (Black)

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HKJ
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Test / Review: Keeppower 18650 3100mAh (Black)

Keeppower 18650 3100mAh (Black)

DSC_1549

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

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

DSC_1550 DSC_1384
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Keeppower%2018650%203100mAh%20(Black)-Capacity

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

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

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

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

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

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



Conclusion

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.



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
Woody
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Good review, as usual.  I've never heard of Keeppower, have these batteries been released yet?

HKJ
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Woody wrote:
Good review, as usual.  I've never heard of Keeppower, have these batteries been released yet?

 

The batteries are on there website and I hope the reason the asked me to test them is because they want to sell them and probably not only as OEM.

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

Woody
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I had a quick look here:

http://www.keeppower.com.cn/?MainID=4&ID=131&Language=en

but didn't find a price or place to buy. As you say, I guess we can expect to see them following your review.

BetweenRides
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Thanks, HKJ. I hope we see them for sale soon. We need more oem options - too many mystery wrapped cells out there.

RedForest UK
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Yeah, if I remember correctly the eX-cell 3100s were OEM from Keeppower, as I think are the CK 3100s and all the Redilasts. They claim to be better quality assembly and components than AW's cells but that is of course open for discussion.

 

They have access to a LOT of good cells and can pick and choose the best performers, I'm looking forward to their 14500s for sure.

Shadowww
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Are Intl-Outdoors 3100mAh cells made by Keeppower too?

Langcjl
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Good review. Thanks

Piers said " ....but who wants enough light, when you have the option for far too much "

ChibiM
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Wow, interestingly, many of the Panasonics 18650 3100`s are in Black.. with the silvery branding..

seems like they all come from the same manufacturer/company.

ri chevy
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Interesting. 

RedForest UK
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Shadowww wrote:

Are Intl-Outdoors 3100mAh cells made by Keeppower too?

 

I'm pretty sure they are.

Woody
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Goingoutdoors, the seller on eBay who stocks these, has just increased his prices – from $22 to $25 per pair. Still good deal & he’ll certainly take a lower offer. He also has Keeppower 2800mAh and 3000mAh (18650).

fishinfool
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Thanks again HKJ!

 

Don wrote:

"But as I said long ago, you are more likely to be killed by a dead fish dropped by a seagull in the Sahara Desert than by a lithium ion

bose301s
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I offered $20 and it was accepted, very good deal for 2 Panny 3100mAh batteries.

http://www.ebay.com/itm/Keeppower-18650-3100mAh-Built-In-Panasonic-18650...

warmurf
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That sounds good. But how far away are 3400 quality batteries?

CM2010
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For some reason the fella who sells them on eBay will not ship to the uk anymore.

Woody
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CM2010 wrote:

For some reason the fella who sells them on eBay will not ship to the uk anymore.

Are you sure? The Uk isn’t in his list of exclusions here.

CM2010
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He must of changed his mind as GB has been in that list for the last two weeks.