Out of the nearly three years of ownership of my iPhone 4 I had always assumed that the battery was more trouble than its worth to replace. At this point, though, I couldn't take the lack of actual battery capacity anymore as I still used my iPhone 4 as an iPod. With the WiFi on and Pandora streaming you'd be lucky to get two hours of background music before recharging. Last week I ordered a replacement on Amazon for a grand total of $4 and it even included the screw driver to open the iPhone. After a quick YouTube video, three tiny screws, and about ten minutes of trial and error my phone was back up and running with a fresh battery. I should of done this well over a year ago when I first noticed that my battery was beginning to fail. It would of saved a lot of trivial charging. If anyone else is noticing that their old phones aren't holding a charge like they used to it probably isn't the latest iOS, but the fact that the lithium cells are past their recommended charge cycles.