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I have a set of Turnigy Li Po 300mAh 20-40C batteries.
Is there any way of telling when they start to become dangerous?
A new battery measures around 8.18mm a used one (cannot tell you how long sorry) has swollen up to 8.74mm.


Cheers
Joe

Yeah, good question and I don't have any good answer. I little bit swollen I think is OK but yours might be on the edge. In this case probably better save then sorry... I don't think I ever heard of a battery becoming more dangerous because it is swollen though.