I don't think the battery is damaged. Reverse polarity to ESC is supposed to damage ESC not battery. That momentary short could've caused the internal connection to give way or something. If it didn't melt off, you would've had a puff or even blown pack. Open it up, check and fix it. If you're not up to it, pass it to someone who has the guts to do it. No big deal, really...
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