My battery was low so I bought one on Ebay. After about a year phone started to turn off and on and would now hold a charge. Would take battery out and back in and it would work for a while but then the problem got worse. It would show battery was full but then it would completely discharge and start rebooting. I finally bought another battery and the problem solved. I guess the 2nd battery was defective . Bought new one at Batteries plus . They guarantee the battery for life as long as your phone is working correctly