I have a TiBook 667 that I bought about 10 months ago and the battery in it would only give me around 1hr 40mins of use, which is far from the stated 5hrs. So, I thought that before my warranty ran out I'd try and do something about it.
I rang up Apple told them my situation and without any further questioning of the matter they took my details and said a battery way on its way. 3 days later there was a knock on my door and the battery had arrived, I gave the courier my old battery (part of the warranty exchange) and began charging my new one.
I now get around 4hrs 40mins from my battery!!!!! Go Apple!!!
As you can see I am IMPRESSED! Another reason why Apple is so loved.