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

HKJ

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[size=+3]Keeppower 18350 1200mAh P1835C2 (Black) 2017[/size]

DSC_2337.jpg


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 x 39.0mm

Keeppower%2018350%201200mAh%20P1835C2%20(Black)%202017-info.png


A high capacity protected 18350 cell from Keeppower. The actual cell is also high current, but the protection limits this a bit.

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DSC_2336.jpg


DSC_2338.jpg
DSC_2339.jpg


DSC_2340.jpg

DSC_2341.jpg


Keeppower%2018350%201200mAh%20P1835C2%20(Black)%202017-Capacity.png


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.png


Keeppower%2018350%201200mAh%20P1835C2%20(Black)%202017-CapacityTimeHours.png


Keeppower%2018350%201200mAh%20P1835C2%20(Black)%202017-CapacityTime.png


Keeppower%2018350%201200mAh%20P1835C2%20(Black)%202017-Energy.png


Keeppower%2018350%201200mAh%20P1835C2%20(Black)%202017-PowerLoadTime.png


Keeppower%2018350%201200mAh%20P1835C2%20(Black)%202017-TripCurrent.png


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.png




[size=+3]Conclusion[/size]

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.



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

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
 

ChrisGarrett

Flashlight Enthusiast
Joined
Feb 2, 2012
Messages
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Location
Miami, Florida
So it's an 'Aspire' type 18350 with a protection circuit, which may matter to some, but not to others?

Thanks for your endearing work. I appreciate it.

Chris
 

Tachead

Flashlight Enthusiast
Joined
Jan 3, 2015
Messages
3,872
Location
Northwestern Ontario, Canada
[SIZE=+3]Conclusion[/SIZE]

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.



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

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

Thanks for another great review HKJ:thumbsup:.

Is there a review coming for the IMR version of this cell?

http://www.keeppower.com.cn/products_detail.php?id=567

Thanks again:thumbsup:.
 

N/Apower

Enlightened
Joined
Jul 30, 2008
Messages
536
What is the passive discharge rate of the Keeppower 18350 protected cell?
 

N/Apower

Enlightened
Joined
Jul 30, 2008
Messages
536
If you mean self discharge it is generally very low for LiIon and the protection circuit do not draw much (A few uA) either.

Yes, that's what I meant. What % would you put it at? Thanks!
 

HKJ

Flashaholic
Joined
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Messages
9,715
Location
Copenhagen, Denmark
Yes, that's what I meant. What % would you put it at? Thanks!

I have no numbers, but I have both protected and unprotected battery lying around for years, they loose some voltage, but not below 3V.

Just looking in some old boxes:
Unprotected Ultrafire 26650 from 2014 and not used since testing: 3.5V & 3.6V
Protected Keeppower 26650 from 2014 and not used since testing: 3.7V for both.
Unprotected YLE18500 from 2014 and not used since testing: 3.6V & 3.7V

They have been stored at around 25°C
 

N/Apower

Enlightened
Joined
Jul 30, 2008
Messages
536
I have no numbers, but I have both protected and unprotected battery lying around for years, they loose some voltage, but not below 3V.

Just looking in some old boxes:
Unprotected Ultrafire 26650 from 2014 and not used since testing: 3.5V & 3.6V
Protected Keeppower 26650 from 2014 and not used since testing: 3.7V for both.
Unprotected YLE18500 from 2014 and not used since testing: 3.6V & 3.7V

They have been stored at around 25°C
Thanks! how does that equate to "battery life"? I mean, if you load them up, are they down from a theoretical 30 minutes to 5 minutes now, or is it more like they lost 2-3 minutes?
 

HKJ

Flashaholic
Joined
Mar 26, 2008
Messages
9,715
Location
Copenhagen, Denmark
Thanks! how does that equate to "battery life"? I mean, if you load them up, are they down from a theoretical 30 minutes to 5 minutes now, or is it more like they lost 2-3 minutes?

I would assume the 3.6V or lower is dead, the other are probably also about empty and they will have higher internal resistance due to age.
As long as the load is only moderate you can charge them again and use them, I am still using some LiIon 18650 from 2013.

For voltage to capacity see here: https://lygte-info.dk/info/BatteryChargePercent UK.html
 

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