Battery Safety Warning.. Bad batch of Vapcel H10

[mickey10632 (Wichaya P)]

Brand new Vapcell K10 swelling? Not a good sign
https://www.reddit.com/r/flashlight/comments/1qkeo3f/vapcell_k10_swelling/

[koef3 (LED tester)]

Would be interesting to know the manufacturer of that cell.

[thefreeman]

Maybe I’m blind but I don’t see the swelling, do they mean the rounded white plastic cover ? it’s like that normally likely due to the shape of the button plate underneath.

edit : do they means this dark stuff that appears to be leaking ?

edit: it’s indeed what they mean, I didn’t see the picture’s legend.

[ryukin2000]

I haven’t used mine yet and they look fine. But will keep an eye on them now.

[12138]

Thanks for posting this — that’s honestly pretty concerning behavior.

A drop from ~4.15V to 3.8V in a plastic case within a day definitely points to high self-discharge, not parasitic drain. Once you add voltage jumping on the charger and 0A charge current, that sounds like internal damage or a failing protection circuit (or internal short).

The one getting hot is especially scary — you absolutely did the right thing taking it outside. Heat without load is a big red flag.

I’d stop using both of those entirely and keep a close eye on the rest, especially if they’re from the same batch. Appreciate the heads-up.