Bulges are not good. but if it powers up it should be OK but i'd replace them. It just stinks that they are sooooooo expensive. But you could maybe try calibrating the IMU (Internal measurement units) Its what keep the drone stable and level and compensating for movements. That was what i did and i re-installed the latest updates to the firmware and it worked great.
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I don't trust the batteries at this point with the bulges. I think the one I use on the test flight is what caused it to crash. It had plenty of votes and then it had none. It tried to land itself but it was a very hard landing. Will just suck it up an buy a couple of new ones. Will be careful how I store them in the future. It gets very hot here in Texas during the summer time. No more leaving them in the car even if in the case.