Identifying Sofirn 21700mAh cell

Batteries and Chargers Rechargeable Batteries
1

Hi everyone,

i have two Sofirn wrapped 21700 cells. One i got with my IF22A a few months ago (ordered from the official Sofirn shop on AE).
The other cell i got with my LT1S a few weeks ago, this one i ordered directly from Sofirns onlineshop.

Both of them are advertised as 5000mAh which is true, they tested around 4900mAh each. But as you can see in the pictures, they are cleary not the same:



The one on the top is out of the IF22A and the cell on the bottom came with the LT1S. To my understanding, Sofirn’s 5000mAh 21700s cells are re-wrapped Lishen LR2170SD. This fits to the top cell which has the typical Lishen triangle as the plus pole and the ring in the bottom. However i have no idea what the other cell is. The writing on the wrap is a different quality, but it also differs in the sense that one has 5000mAh/50A printed on it and the other has 5000mAh/18Wh. Also the Lishen cell has 3,6 Volt nominal voltage printed while the other one has 3,7 Volt.

The plus pole of the unknown cell looks like a Sofirn “high discharge” cell with 4000mAh, but that does not match the tested capacity. Also it’s missing the Lishen ring on the bottom.

Does anyone know what cell this is?

2

Good question.

I have one of the 5000mAh 50A cells.

If those specs are true, it's one of the best 21700 cells available.

3

Wow!
A 50A rating with 5000mAh capacity
Wonder what cell is it?

4

The Sofirn 21700 cell with 3.6V is similar to the Wurkkos 21700, with the same triangular top.

I have another made-in-China 21700 cell called “TangsFire” which boasts the maximum plus discharge of 60A! :laughing: and continuous discharge of 40A.

5

The triangle positive cap is the Lishen LR2170SD with a continuous current rating of 9.6A, I reviewed this for Sofirn and it handled 15A fine. Not sure what the other cell is, could be a BAK cell.

6

They’re either Bak or Lishen cells, which is why the cells themselves are different.

7

Oh, those are two good (and relatively inexpensive) brands!

8

Dang. I came here hoping for a 21700mAh battery, like the title says.