20 - 30 Minuten
My iphone kept crashing and the power would go from any percentage to zero. We did change the battery. But the process was nowhere as simple as the video showed the connections were much tougher to disconnect and reconnect. We had to use a 10 power magnifier to see what we were doing. The problem appears to have been corrected but the phone runs a little slower on gmes and sometimes when typing and is warmer than before. If it lasts for another year that will be fine. apple said it couldnt be done, gee I wonder why ;-)
Read the directions thoroughly especially the one about disconnecting the display. I'm having trouble typing into these fields. Use magnification!
iPhone 3GS Replacement Battery
Phillips #00 Screwdriver