Suddenly my battery will not hold a charge. I've turned off all displays and apps that use power. I've recharged the phone from scratch. The only things that are different since it worked properly and held a charge are (1) I bought a Verizon car charger a month ago and (2) I installed a new game (which I've since taken off). The phone will sometimes stay charged for an hour, and then suddenly turn from green to red, give a one second warning that battery life is under 15%, and then instantly powers itself off. When I recharge it with the wall charger, it will say it is charged in just 5 minutes and then it discharges in 5 minutes. Any thoughts?