Test/review of Sofirn 21700 5000mAh (Black)

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HKJ
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Joined: 05/24/2011 - 12:23
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Location: Copenhagen, Denmark
Test/review of Sofirn 21700 5000mAh (Black)

Sofirn 21700 5000mAh (Black)
DSC_4195
Official specifications:


  • Battery Capacity: 5000mAh
  • Battery Voltage: 3.6V

Sofirn%2021700%205000mAh%20(Black)-info
A high capacity 21700 from Sofirn.
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DSC_4196 DSC_4197
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Sofirn%2021700%205000mAh%20(Black)-Capacity
The two cells match nicely and have a build in fuse that I blew on both batteries, one at 30A and one at 20A.
Sofirn%2021700%205000mAh%20(Black)-Temp-10.0
Sofirn%2021700%205000mAh%20(Black)-Temp-15.0
Sofirn%2021700%205000mAh%20(Black)-Temp-20.0
Sofirn%2021700%205000mAh%20(Black)-CapacityTimeHours
Sofirn%2021700%205000mAh%20(Black)-CapacityTime
Sofirn%2021700%205000mAh%20(Black)-Energy
Sofirn%2021700%205000mAh%20(Black)-Charge
Some test is missing due to the blown fuse in the cells.
Conclusion
The batteries looks like good batteries, but be careful with overloading them, the protection will disable the cell permanently (This is, of course, better than risking a battery explosion).
Notes and links
The batteries was supplied by Sofirn 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

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

ggf31416
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Location: Uruguay

Thank you! Tests for batteries which come bundled with flashlights are very useful for the community.

Kaddaman
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Joined: 03/01/2021 - 16:34
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Thank you for this! Could you do the same for the 4800 mAh and maybe even for the 4000 mAh 21700 cells?
The Sofirn (rewrapped) cells seem to be good quality and a more affordable alternative to Samsung & co. Especially where I live, li-ion cells are expensive as hell, thus most of my cells are from Sofirn, no matter which size.

Lux-Perpetua
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Thank you for the review, HKJ. I hope Sofirn can send you another pair anytime soon.

The raw cell underneath the shrink is a Lishen LR2170SD. Here are the manufacturer’s specs:

Diameter: 21,7mm ± 0,2mm

Length: 70,9mm ± 0,2mm

Weight: 72g ± 4g

Nominal capacity: 5000mAh at 0.2C discharge current 

Minimum voltage: 2.50V

Maximum voltage: 4.20V ± 0.03V

Standard charge current: 0.2C (1000mA)

Maximum charge current: 0.7C (3500mA)

Maximum discharge current: 2C (10000mA)

Initial internal impedance: ≤ 30mΩ

 

Funtastic made a review, too:

https://budgetlightforum.com/node/76591