5 - 30 minutos
Replaced the iPhone4 battery
Using the iPhone4 Liberation kit, the Pentalobular screws were easily removed. The Phillips screw driver that came with the kit did not fit the replacement Phillips screws. Luckily I have the right screw driver at home. It took about couple of minutes to replace the battery. The saving was not that important to me but replacing the battery by myself without having to go back to Apple gave me the satisfaction.
View the install video first. Everything is straight forward.