RE: Is it dead?
this also happend to me once with a 3 cell lipo.
Here is what happened:
I only had a lipo charger that you would have to connect to a car battery.
But I kind of got tired to allways have to go outside, so I thought I would connect the charger to a battery booster charger.
I tried it several times but it never worked and the charger allways gave me an error message.
Later...I read the instructions that came with the charger and it said not to use a battery charger to power up the lipo charger...
and after a couple of days one of the cells bulged out[:'(]...and the battery wouldn't work anymore[:@][&:].
The good news is... if you think the other cells are still un damaged you could convert the battery to a 2 cell lipo... worked great for me!