I've got one of those old vape batteries in a tiny pocket torch I carry with me. The torch used to have a shabby type cheapo 14500 battery in it, very light weight and little capacity. It was soldered to the swicthing and re-charge board inside the torch and it stopped working the other day. The issue was the battery. It was totally dead and would not charge. I have no idea why it gave up like it did, because it was not neglected.
Anyway - while I was looking at it, and thinking about getting another 14500 battery, I remembered that I had picked up a broken up disposable vape in the street about a year ago. It looked as if someone had trodden on it and there was the perfectly sound little 500mAhr battery. I salvaged that bit and charged it at the time and put it in a plastic bag and left it for some future project.
arstechnica.com
