Mine was fine for 3/4 months. then all of a sudden it would go into a restart cycle, until I put it on charge. the battery shows different percentages when it does this. I've seen as high as 90% and as low as 40%. It will claim to be fully charged in less than an hour. The battery has also swelled about 10-20%. the phone no longer slits flat on a surface (even with battery out). I intend to push for a handset replacement as well as the battery because the phone has warped slightly. and the constant restarting suggests a deeper issue. Hope this helps.