Just a quick question, I was sitting at the computer with an NiMH AA cell charge running behind me and heard a sudden "hiss" sound, fairly quiet and lasted about 1 second.
Was this a cell dying while charging? I put a finger to the cells (two charging together in a commercial charger, Ansmann branded charger and cells), both were hot but not more so than usual during charging. The charging cycle appeared to complete normally a few minutes later.
There's no visible damage to the cells at all, but I cannot think what else in the room could possibly have hissed like that.
Is there any electrical test I can easily perform on the cells to know if one has just done this? Preferably not one which needs them fully discharged again before recharging again. I'd rather not just dispose of them on suspicion of having vented if they might actually be fine and the hiss came from elsewhere, but would rather not put them back in to use if one has vented itself.
The two measure 1.455V and 1.454V right after the charge cycle ended.
I don't have any fancy internal resistance meter on hand, just several voltmeter/ammeter/ohmmeter multimeters, and an o-scope.
Thanks