I'd try contacting them 1st before trying to 'rescue' one that way, the lipo is basically bad or has a weak cell and you deserve one like the other that's not this way. Even if you 'rescue' it as described, it prob won't perform a well as the one that didn't start off this way.
Hobbypartz used to have a few one here that would respond to probs like this, you might try looking in the electric off road thread and see if they're still around.