Just got a brushless edition Revo!

[turbo4]

It looks like I just puffed my first lipo. I am using (2) maxamps 2s 6000mah(these are the 2s2p) I have ran them w/o issues in my emaxx for probably 25 cycles. I have not had issues up till now in the BE e-revo. I ran the pack for aprox 20 minutes, then switched the stock wheels/tires for some proline offset dish wheels with proline badlands on them. I finished out the packs on them, but I did run till it was obvious that the packs were spent. When I pulled the packs to charge one was fine and the other was puffed. It seems that one side draws more than the other, as with my emaxx I assume that one side is powering the servos solely?

I have always balanced these packs while charging since new. Upon discovering the puffed condition I put my balancer on to see what was going on. It appeared that this pack had become severely out of balance. (I use astro blinkey balancers.) I guess I'm puzzled as to what caused this condition. I have the esc set for auto lipo. The packs probably have 30 cycles on them.

1. ran the packs down to far?
2. the change of wheels had an effect?(the prolines have an overall smaller circumference)
3. maxamps packs suck?()
4. It just happens?