July 12, 2008 | Tim Bradbury
As I’m sure you know, the original iPhone’s battery was very difficult to remove from the unit itself. If you happened to have the misfortune of possessing a faulty battery, oftentimes the easiest remedy was to get the iPhone itself replaced by Apple (if it was still under warranty.) If your warranty had expired, you were pretty much out of luck, hopefully the story will be different with the iPhone 3G.
Very recently, iFixit opened up the iPhone 3G and took a look inside (see article.) From the get-go it was apparent that the battery was not soldered directly to the board. While in its present state the 3G battery is by no means “easily” replaceable, with a bit of time and effort it can be replaced.
I’m sure we can expect to see a DIY project emerge with time, detailing the exact process required to replace the 3G battery by yourself. Until then, you’ll just have to rely on Apple to replace your battery (or you could take the plunge and open your 3G, something I would strongly advise against.)