This is why I'm skeptical of hardware signing devices with permanently installed batteries. Just pulled a Ledger Flex out of storage (in optimal cool & dry conditions) and the battery has swollen and burst out of the back panel. Device still works but only when plugged in.

Replies (9)

Sorry to hear mate! But that’s a major concern of mine as well and one, I believe, too few people (both on the consumer and the producer side) pay enough attention to.
I've seen this with phones many times. I wonder if it would be better to build it intentionally to only power on when plugged in, leaving out the need for a battery. Less convenient, but also less to go wrong.
I don't think it even matters WHAT device it is, permanent batteries were a mistake. I wish phones had replaceable batteries again