I bought my Evo off craigslist with a root on it and i couldn't activate so i unrooted it. While booting up the battery died so i tried a few more times, the battery became unresponsive, wouldn't let me charge it or would it turn on my phone for even a second. I went to sprint and he put in a new battery and it worked. He charged me $30 for a new battery he picked up off the floor... I used that battery for a few days. Today i had my phone plugged in charging and turned on and next thing i know its dead and not charging anymore... Is this just a freak accident or a common problem? What should i do? Is this something that happened because of the root?