Sofirn 21700 4000mAh = ?

[Helo]

@rdhood

@Helo

@rdhood

@niajef

@rdhood

I got 4330maH for the Sofirn 21700 that came un my IF25A, tested with a btc3100… yes, a flattop 21700 fits.

What was the label, 4000 or 4800?

4000maH

Unless you got the 4800mAh cell in a 4000mAh wrapper, your BTC-3100 is likely overestimating the capacity (not uncommon for that charger).

I bought 20 new LG 2850mah cells, and they all came between 2830 and 2849. Same for dozens of other cells and capacity. The ONLY two cells to ever come up over capacity is my sofirn 4000 mah 21700 and my wurkkos 4800mah. Thats it. I think that two high out of dozens…if not hundreds … of cells is probably unlikely. That includes liion and nimh… aa,aaa,26650, 18650, 21700, 14500.

You must have gotten lucky and gotten the 4800 mAh cell in the 4000mAh wrapper. Nice. Funny enough, Sofirn’s store page lists the IF25a as coming with a 4800 mAh cell but the pic shows the 4000 mAh one so there could indeed be a bit of cell lottery going on. I vaguely recall reading something similar with regards to their 5500 mAh 26650’s.

Edit: found this:

“I asked Tracy at Sofirn if she could explain the capacity of their 26650 cells. Some are sold as 5000mah and some are sold as 5500mah.

Sofirn wrote:
Hello. The service is correct. Sorry for the confusion that we have caused. As the battery capacity between 5000mah –5500mah, so some we lable 5000 and some we lable 5500. Actually the two label batteris are the same one. Thank you. Tracy “