As has been well reported, and is in fact the subject of a lawsuit over in the States at the mo, the iPhone's battery cannot be replaced by mortals.

It's built in to the device, so once you've had your 400 or so charges out of it, your iPhone must be sent back to Apple for an $80 swap over.

Brando are offering an alternative though - for $20 you can buy a replacement battery for a DIY swap, that comes complete with instructions and tools.

Caution would be advised before you attempt home-brew-style surgery on your purty phone - saving $60 can't be worth destroying your fave toy...