Test/review of Keeppower 18350 1200mAh P1835C2 (Black) 2017

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HKJ
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Test/review of Keeppower 18350 1200mAh P1835C2 (Black) 2017

Keeppower 18350 1200mAh P1835C2 (Black) 2017
DSC_2337
Official specifications:


  • Nominal capacity: 1200mAh
  • Nominal voltage: 3.7V
  • Charging method: CC-CV
  • Charging voltage: 4.20V
  • Std. charging current: 500mA
  • Discharge cut-off voltage: 2.50V
  • Max. constant discharge current: 8A
  • Size: 18.6 × 39.0mm

Keeppower%2018350%201200mAh%20P1835C2%20(Black)%202017-info
A high capacity protected 18350 cell from Keeppower. The actual cell is also high current, but the protection limits this a bit.
DSC_2335 DSC_2336
DSC_2338 DSC_2339
DSC_2340
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Keeppower%2018350%201200mAh%20P1835C2%20(Black)%202017-Capacity
The batteries has good discharge curves, they tracks fairly well and capacity only drops slowly with current. 5A works fine, 7A is limited by the protection.
Keeppower%2018350%201200mAh%20P1835C2%20(Black)%202017-Temp-5.0
Keeppower%2018350%201200mAh%20P1835C2%20(Black)%202017-CapacityTimeHours
Keeppower%2018350%201200mAh%20P1835C2%20(Black)%202017-CapacityTime
Keeppower%2018350%201200mAh%20P1835C2%20(Black)%202017-Energy
Keeppower%2018350%201200mAh%20P1835C2%20(Black)%202017-PowerLoadTime
Keeppower%2018350%201200mAh%20P1835C2%20(Black)%202017-TripCurrent
I did not trip the protection during this test, but as can be seen from the discharge curves it will trip at 7A after some time. I just used an estimated 8A in the info block.
Keeppower%2018350%201200mAh%20P1835C2%20(Black)%202017-Charge
Conclusion
This battery is from the new generation of smaller cell with much improved performance. This means that this battery is one of the best 18350 at the current time. The protection means slightly lower output voltage at high current, a limit on maximum current and overdischarge protection.
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
Comparison to other LiIon batteries

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

everydaysurvivalgear
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Thanks for the review mate!

18350 are slowly getting better. Any thing new and exciting with 16340s?

Agro
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CrashOne
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Too bad they didn’t use a 10A pcb. Do you know which brand is under the wrap?

Agro
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There is one well known cell with exactly the capabilities we see here: Yong Deli, commonly known for Aspire wrap.

GozonM
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Thank you for test! I ordered this… Smile

Barkuti
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Personally, I'd pull out the protection board (maybe even the button top) and rewrap the cell. 

 

Cheers 

 

 

HKJ
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Barkuti wrote:

Personally, I’d pull out the protection board (maybe even the button top) and rewrap the cell.

I would suggest you buy the unprotected version instead and it is probably cheaper

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

Agro
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I checked a couple of days ago, there were no known international sellers of unprotected. Now one appeared, but more expensive:
https://www.aliexpress.com/item/4pcs-Keeppower10A-discharge-IMR18350-120...

firedome
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Thank you for test! Thumbs Up

“We can easily forgive a child who is afraid of the dark; the real tragedy of life is when men are afraid of the light.

-Plato

EagleShield
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Agro wrote:
There is one well known cell with exactly the capabilities we see here: Yong Deli, commonly known for Aspire wrap.

So the Aspire is rewraps of these?

Link: http://www.ydlxny.com/pc/en/product_d1.asp?idd=62&ids=4&SortID=18&id=18&idid=4&ord=5

Maybe you can write a nice mail to get a sample to test.

I can’t find them for sale anywhere tho.

Agro
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Yes. And Aspire is actually a co-owner of the factory.

Windsurf
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Can I please get an update on these batteries. Have the worked as expected or better? Were the ones from AliExpress real or fakes? I would like to buy some if they turn out to be real and are as good as tested.

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Windsurf wrote:
Can I please get an update on these batteries. Have the worked as expected or better? Were the ones from AliExpress real or fakes? I would like to buy some if they turn out to be real and are as good as tested.

If you want a reliable USA vendor, Illumn sells the unprotected flat top and the protected button top Keeppower 18350 cells.

Windsurf
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Thanks I just put in a small order with Illum to test these batteries. It would be great if these batteries work in my flashlights with all that extra power and the higher discharge rate.

Barkuti
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These cells are not what they used to be, pretty sure. Check Vapcell INR18350 1100mAh retested by Mooch: shenanigans again for related information.

Keeppower, Vapcell, Shockli and such rewrap cells from OEMs, and pretty sure they are rewrapping the same cell. In the absence of updated formal testing, it can be safe to assume the performance of the cells is somewhat inferior to what you see here.

 

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Thanks for the info. I haven’t been keeping up on new batteries and was about to buy more of the batteries I already own to make sure I had plenty of batteries in case there is a large tariff or blockade of stuff made in China. But you guys gave me an education that really helped me. I didn’t realize the improvements made in the 16340s and 18350s.

So I ordered a small bunch of batteries and gave them a capacity test in my Liitokala-500 charger. I learned a couple of things. These newer batteries had a higher discharge rate which worked great in my flashlights making them brighter which is always a good thing. But because the discharge rate is higher I was afraid the batteries would empty faster but because these new batteries have a higher capacity they seem to last as long as my older lower capacity batteries but are much brighter. A win win for me.

Here are my test results. The 16340s were tested at 300Ah and the 18350 were tested at 500Ah.

Vapcell INR18350 1100 tested at 1097 and a second battery at 1115.
Vapcell INR16340 800 tested at 797 and a second battery 765.
Keeppower IMR 18350 1200 tested at 1156 and a second battery 1152.
Efest INR 16340 700 tested at 731.
The one battery that didn’t test as well was the Keeppower 18350 Button top w/protection circuit 1200 tested at 983. Since I only had one of these batteries I let it sit for 24 hours and then tested it again and this time the 1200 tested at 1068. A small improvement. Maybe if I had tested it at 300Ah rather than 500 it might have tested better.

Now that I know how well they tested I already put in a second small order before the tariffs come in and the new supply goes up in price. I added a couple of 18350’s and one 26650. I’ll post those results when they arrive.

Thanks again. My old 16340s and 18350s aren’t that bad so I will keep them in storage for an emergency.

Barkuti
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Windsurf wrote:

Vapcell INR18350 1100 tested at 1097 and a second battery at 1115.
Vapcell INR16340 800 tested at 797 and a second battery 765.
Keeppower IMR 18350 1200 tested at 1156 and a second battery 1152.
Efest INR 16340 700 tested at 731.
The one battery that didn’t test as well was the Keeppower 18350 Button top w/protection circuit 1200 tested at 983. Since I only had one of these batteries I let it sit for 24 hours and then tested it again and this time the 1200 tested at 1068. A small improvement. Maybe if I had tested it at 300Ah rather than 500 it might have tested better.

First of all let me say analyzing chargers measure a bit differently depending on bay or channel (termination voltage, sense resistor and related components' accuracy, etc). Having said this, the above not so good consistency is typical of lesser tier battery OEMs.

The overrated KeepPower 18350 “1200” cell is the same as the Vapcell 1100, and none of 'em are what they used to be. But well… 

 

Cheers Smile 

Windsurf
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The Vapcell 1100 and the Keeppower 1200 may be different cells b/c the Vapcell is listed at a max discharge rate of 9A while the Keeppower is 10A continuous and 15A pulse. The keeppower seems a tad wider although it could just be the wrapper. I think the Keeppower 1200 is te same as the Shockli 1150. I may buy a few to check them against the Keeppower.

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I think all three (Shockli, Vapcell and KeepPower 18350s 1000-whatever) are from the same OEM.