Brangdon
Newly Enlightened
I just bought a new 18650 torch, and a new battery to go with it. I also have an old battery that was bought for a Surefire U2 back in 2005, from Lighthound. It is a protected 2200mAh. This was flat. It's been sitting on a shelf, virtually untouched, for 10 years. (The U2 has Cr123s.) I forget what voltage it held, but it was under 0.5v. Rather naively, I put it in a (also new) charger, along with the new battery. After a few hours, neither charger light showed green, but I took them out anyway and tested them. The old battery showed 4v, now dropped to 3.97.
So, now what? It looks and measures fine, but I gather there may be internal damage. Is there any way to find out? I suspect if I put it in the torch it would work, but it might also make a pipe bomb.
So, now what? It looks and measures fine, but I gather there may be internal damage. Is there any way to find out? I suspect if I put it in the torch it would work, but it might also make a pipe bomb.