Is the iPhone battery replaceable?
Yes. Apple has an official out-of-warranty battery replacement program for $79 + $6.95 shipping. Currently, the official battery replacement service for iPhone batteries requires sending the iPhone to Apple, as with iPod. Apple will provide a loaner AppleCare Service iPhone (“AppleCare Service Phone”) while your iPhone is being repaired or serviced for a fee of $29. Such service will be possible via any any Apple Retail location, an Apple Authorized Service Provider, or via an online service request process. Apple actually replaces your whole iPhone with an equivalent new model or factory-refurbished model in a brand new enclosure, with its own 90-day service warranty. Similar procedures will be developed for worldwide markets. There will likely be several other do-it-yourself or mail-in methods of replacing the battery when necessary, as with iPod. More information will be posted as it becomes available.