Support Pantech Burst battery drains faaassssstttt

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http://androidforums.com – What is wrong with my phone? In 45 mins the battery went from 50% to 11%? I was asleep and no apps or any thing on the phone was being used. I tried charging it but it took about 30 mins to charge from 4% to 6%. Also, my mom has the Pantech tablet that came in the phone deal (forgot the name -__-) and i tried using her chager that outputs 2A and it charged a lot quicker. My charger is a 1A. What's going on? Is it the phone or battery or charger? Help pleaasseee. (General)