One will probably remember iPod owners massively complaining against Apple about the lack of replacement battery for most early iPod models. Cupertino was forced to quickly organize a dedicated program. Apple has learned from the past and already communicates about the iPhone battery and the existing service for having it exchanged (out of warranty). It will cost US$79 + US$7 shipping cost, it is of course quite expensive but it already proves Apple will not let consumers alone in the dark when needing a new battery for an iPhone.
[translation by Linathael]