All was fine until it wasnt lol

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So as the title suggests my vape was working perfect (friend gave me his inoy maxo after mine got fried) went to bed woke up put my batteries in my charging station waited till basically full put em back in when it said only only one of the two battery bars was full usually when all four are charged both bara are full, this is my inexperienced question is it the batteries or is the box messed also note the batterys are around six seven months old starting to fray the wrap etc

All was fine until it wasnt lol