20 - 30 minutos
iPhone 3GS just would not hold a charge. Sometimes, it would not even charge when plugged in to wall outlet. Time for a new battery...How hard could it be right?
Found the iFixit battery for a nice low price with tools to make the repair simple. No hunting for the right size screw driver. Followed the iFixit instructions which are excellent. Twenty minutes later I'm booting up the iPhone 3GS with it's new battery and everything is great.
If your hesitant about changing out your battery, don't be. It is very easy.