5 - 30 minutos
My iPhone 4 was used by my wife for almost 2 years before I bought her a new one and took the old iPhone to use for my business. The battery life was horrible and I had to constantly had to plug it up to the charger to keep it running throughout the day.
I searched the Internet and found ifixit.com information on the tools and battery replacement guide for my iPhone 4. It seemed easy and much cheaper than sending the iPhone back to Apple to replace the battery. Everything worked just like the video and step-by-step guide said it would. It was very easy to change the battery and the new battery I bought from ifixit.com is working great!
Don't be scared to change your own iPhone battery because Apple says you need to send it to them. If you can use a screwdriver and follow simple directions, you can do this yourself!