Test/Review of Keeppower 18650 3600mAh (Black) 2014

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HKJ
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Test/Review of Keeppower 18650 3600mAh (Black) 2014
Keeppower 18650 3600mAh (Black) 2014

DSC_4431

Official specifications:
  • Brand Name: KeepPower
  • Type: Li-Ion
  • Size: L:69.00mm*D:18.50mm
  • 18650 3600mAh Protected Rechargeable Battery
  • Min Capacity: 3500mAh
  • Typical Capacity: 3600mAh
  • Normal Voltage: 3.7V
  • Quality Lithium Ion rechargeable cell made in Japan
  • 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%203600mAh%20(Black)%202014-info

This is the next increase in battery capacity, from 3400mAh to 3600mAh, as usual with battery capacity increases it is only an small amount.
With my test conditions (Discharge to 2.8 volt), I do not get 200mAh more capacity, more like 100mAh.
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.

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DSC_4432 DSC_4433

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Keeppower%2018650%203600mAh%20(Black)%202014-Capacity

The battery can easily deliver 7A with its 11A protection and, being good cells, the two cells does also track nicely.

Keeppower%2018650%203600mAh%20(Black)%202014-CapacityTimeHours

Keeppower%2018650%203600mAh%20(Black)%202014-CapacityTime

Keeppower%2018650%203600mAh%20(Black)%202014-Energy

Keeppower%2018650%203600mAh%20(Black)%202014-PowerLoadTime

Keeppower%2018650%203600mAh%20(Black)%202014-TripCurrent

Keeppower%2018650%203600mAh%20(Black)%202014-Charge



Conclusion

When comparing this battery to the 3400mAh cell, the new battery has slight higher voltage and slightly higher capacity, this is not a revolution in any way, just a small improvement.
Being based on a Panasonic cell the battery is, of course, a very good battery.



Notes and links

The battery 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/

StyXSIS
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It’s 208mah off the rated capacity, how can that be HKJ if it’s a supposed 3600mah, i’ll bet it’s one of those…… uh hum! “Mislabeled” ones.
Thank you for the reviews, and great info you give us, they are all always Appreciated.

Simon

koyotee
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“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”.

Finaly, proud owner of a Powerex Maha mh c-9000 for my Eneloops:)

led4power
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“Cell made in Japan” And IC? Smile

ri chevy
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You all have to cut down on the negativity in other peoples threads.

Another excellent review Henrik! Thank you for doing this for all of us. Smile

ruffles
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Thanks very much for the review. Always appreciated.


 

FMcamaroZ28
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Excellent review.

Can you tear one apart? I want to see what a 3600mah cell looks like.

Hikelite
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Higher voltage, capacity seems to be in the same ballpark down to 2.8V, even at a light load of 0.2A

THS89
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Good review. Seems similar to the orbtronic 3600mah

RedForest UK
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THS89 wrote:
Good review. Seems similar to the orbtronic 3600mah

Keeppower is the OEM for quite a few other well-known li-ion battery brands.

MRTdiver
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I wonder when E2 Field Gear or illuminationSupply will stock these.  Is there another US supplier I'm missing?

 

HKJ also tested this cell at 7A.  nice to check out.   Comparator

נֵר־לְרַגְלִ֥י דְבָרֶ֑ךָ וְ֝אֹ֗ור לִנְתִיבָתִֽי   (Psa 119:105)   

Sirius9
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Thanks hkj for this review.
Wallbuys -> group buy ASAP : ) (althout, I would preffer Panasonic labeled ones)

 

DB Custom
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Looks good, but I don’t like the brass negative end. I sometimes use Cottonpickers chargers even on the bigger cells and the brass end kills the magnetic lead connection.

Is this cell going to be available as a direct Panasonic offering in un-protected format? I’d like it for my Terminator. 4 of these would give great runtimes! Smile

Hikelite
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DBCstm wrote:
Looks good, but I don't like the brass negative end. I sometimes use Cottonpickers chargers even on the bigger cells and the brass end kills the magnetic lead connection.

It's copper gold plated. You can see the fibers of the FR4.

DB Custom
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The board? Are you saying you can see the fiberglass circuit board through copper and gold? Man that’s some thin stuff!

Either way, solid gold or whatever, magnetic charger leads won’t stick. They’ll do fine in my Soshine Max though! Wink Just don’t know if their amperage capacity will be high enough. Should do in a set of 3 for the S2200 though. I like the curves on the above charts, so I’ll find somewhere to use a few of em at the very least….

Hikelite
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I can see the weave a bit, that can be seen on all FR4 boards more or less, depending on copper thickness, angle of light, central focus of the camera.

Yes if it's not some sort of SS plate no magnets will stick. AWs usually have some SS plates.