slight puff is ok, it was likely from over drawing at some point. I have a couple packs like that, but they still work fine. When they really start getting puffy is when you should worry. Just keep an eye on it getting any worse. Take the regular precautions of charging in a non flammable container or area and the area is clean of flammable stuff... don't leave them unattended.
A fake charger will charge them just fine, it's just the components in the thing might not be so great. As long as the cell voltage is correct and balanced.
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I futz with V2s, V3s and V6s. I could be wrong... but probably, most likely not, as far as I know.
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