Just thought I'd throw in this little mystery and ask 'What was happening' ?
I had a number of LiPo cells on my bench, recovered from lap top batteries, and I happened to touch one of them. It was very hot.
Suspecting that the thing may burst into flame I quickly took it outside and left it on the path.
Next day, expecting to find it destroyed, I was surprised to find it still intact. And quite cold.
So I measured the voltage; 4.3 Volt.
I then used my ISDT SC 608 Smart charger to have a further look at it.
It appeared to be fully charged.
I discharged it at 300 mA, taking quite a time to achieve this . Then recharged it.
The mystery is, it seems quite ok. Holds it's charge. Hasn't got hot again.
So what happened ? If it was getting so hot (virtually untouchable) why did it not use up it's charge ?
It is a green Samsung 18650-22F. SDI 942 cell.