Test/review of Keeppower 18650 3500mAh P1835K (Black) 2019

[size=+3]Keeppower 18650 3500mAh P1835K (Black) 2019[/size]



Official specifications:

• Capacity min.: 3350mAh
• Capacity typ.: 3500mAh
• Nominal voltage: 3.70V
• Charge voltage: 4.20+/-0.05V
• Standard discharge cut-off voltage: 2.50V
• Standard charge current: 1700mA
• Charge termination current: 50mA
• Max. continuous discharge current: 8A

This is a 3500mAh protected 18650 battery from Keeppower.










The two cells match very nicely. At continuous 7A the protection trips before the batteries are empty.





















[size=+3]Conclusion[/size]

This is very good quality protected batteries and one of the highest capacity 18650 batteries available.



[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
Graphical comparison to 18650 and other batteries
Table with all tested LiIon batteries

Impressive battery! Thanks HKJ

Sent from my Pixel 2 using Tapatalk

Looking at the graphs and reviews, I can't tell if this battery is better than the Orbtronic 3600 or vice versa.

I don't see how this gets a very good rating, when contrary to it's specification of 8A continuous discharge, for all practical purposes it seems it can really only offer 5A continuous. I think companies that blatantly lie on the specs should be called to task on that. I feel I can say 'blatantly' because as noted in the review the protection circuit cuts off before 8A and at 7A the two cells have very different behavior meaning it is already beyond the nominal specification for the cell. It 'might' be a very good 5A cell, but if they can't give the real specifications, then there is a chance the life expectancy of the cell may be severely compromised in some applications, or it could indicate other quality control issues. I expected more from Keeppower, but it seems like they are going to the dark side.

Looks like sample A trips protection well before sample B and neither make it past 7 amps. And model "P1835K and P1835J" look very much the same on the graphs provided, including protection tripping points around 7A. Are these INR or NCR models? Maybe KP doesn't want to say? I see one is made in Korea and one Japan both assembled in China so I guess you can surmise the makers. I guess the "j" and "K" indicate country of origin.