Don't be too mad at your brother.
It was most likely a failure of the internal charge circuit or just a bad battery.
Lithium polymer batteries are charged at a precise rate - determined by the internal charger.
A properly designed LiPo charger will NOT let the battery go above 4.2 volts. If I recall correctly, damage occurs just over 4.23 volts. Usually starts by ballooning.
If you have radio control hobby shops in your area, they may be a good place to find a LiPo cell that would fit. They may also be kind enough to solder your connector on it.
Good luck!
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