20 - 30 minutos
My wife's IPhone was shutting off at 97 percent. Now the phone is showing the lower numbers. Today, the phone got down to 14 percent. That is a REAL improvement.
The repair went exactly as the instructions said. Had one little problem tho. The largest of the contacts didn't want to snap back together. Took 2 or three tries to get the contact to fasten. It finally snapped securely. I did NOT try to force it. I was REAlly gentle.
Do NOT try to work on an IPhone if you do not have any patience. You will pull your hair out, bang your head against the wall and then throw the phone. =) Make sure you follow the instructions and you will be fine.
iPhone 3GS Replacement Battery
Phillips #00 Screwdriver
SIM Card Eject Tool