Crash... Battery or ESC sync?

Hi,I have a homebuilt "Spyda 500" quadcopter that I was trying to tweak the handling on so I tried the Autotune on my APM. The autotune lasted about 5 minutes and seemed to be almost completed and then it seems to just flip to the side and drop like a rock. I know this could be due to motor/ESC sync issues but I wanted to get an opinion on a battery issue. I was using a lipo that was only slightly swollen/ballooned. I thought it was very slight so I used it. But after the crash, I found that it was no longer swollen at all and seemed almost flexible. Could it have popped internally with no signs because of the auto tune process and then that crashed it? Or is that not likely? The battery still charges under a balance charger and all three cells are near the same voltages, but none of them are holding the charge like they did before.Otherwise, if it is ESC/motor sync, what do I look for in the logs to recognize that? Roll and roll input?Thank you

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