Continuous rebooting after battery replacement. iPhone 3GS
20 - 30 minutos
Suddenly my iPhone battery life was too short.
After installing the received new battery using ifixit guide, the iphone was unstable, rebooting every time. After googling I found It's a problem with battery compatibility.
I wrote an email to ifixit describing my problem and after sending my iPhone model number they sent me a new battery and problem solved!
Fast and excellent support. Thanks