Sorry if this has been asked before (actually no, I'm not sorry) but all this talk about using an old g3 iBook has made me want to get mine out and going. So i want battery life again, instead of plugging it in all the time. Have you guys replaced yours? if so was it worth it and has the battery lasted long? how much time do you get out of a single charge? I saw one from the UK for around $80, was thinking of getting it. But if its only going to last 1hour i dont want it.