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Thats not a bad thing... When you rebooted the phone it couldn't of miscalculated the battery problem plus you are using a game that requires a good bit of processing power... 3% is not bad 30% is bad...
try to slowly drain it down till the phone turns off then charge it back up. Seems these batteries get better over time.

Did you read what i said? It could of been a temporary miscalculation try playing for half an hour and see the percentage then. also Try doing battery cycles with your phone.Thats not a bad thing... When you rebooted the phone it couldn't of miscalculated the battery problem plus you are using a game that requires a good bit of processing power... 3% is not bad 30% is bad...