i use Quadra LRP Charger no cutoff no nothing i was just doing a refresh for the batteries which is a i cycling mode. it took more than 2 hours, i thought it was good for the cells and kept them until i heard the sound.
how hot were the abtteries when they done this, was it a popping or sounded like air excaping? I had a set off cells have a boiling cells once but they soon after exploded and im sure you would have said if this happens so im geussing it isnt that
they have probably vented, this happens sometimes usually after the cells are a bit into there life with a couple hundred cycles. Some people say that this makes the cells crap on the track but i didnt notice any difference. Just watch when you recharge them as they may false peak