My iPhone 4's battery is on its way out. It doesn't last a full day anymore on a single charge.

Just wondering how difficult it is to replace the battery in one of these phones. I have heard its easy, but I remember how complicated it was to change the hdd in my MacBook pro.

Is it worth the hassle changing it myself? How much do you think I will save by doing so?

Thanks for any advice.
Kev

It's easy. Go to http://www.ifixit.com/Guide/Installi...Battery/3141/1 for a great guide. I used their guide to install a new logic board and new battery. Dead easy