Well I've had my Lipo's just a few weeks, used them only a couple of times on race night and one pack died.... Now being the inquisitive sort I had to find out why. I have 'popped' the case open and have discovered a small crack in the connecting board has caused high current to heat it up and it now looks like a bacon frazzle. Both cells are reading good voltages so with a little creative soldering and some copper strip we should be back in business. Case looks a little ropey though!