Hi, I have a macbook pro 15". model identifier is macbook pro 2,2 My problem is if I don't have this laptop plugged in, it dies after about 30 minutes. I was wondering, if I get a new battery, will that let me keep it unplugged for a few hours, or at least longer than 30 minutes, without it dying? And if so, where do I buy a battery at? Is this the right link: http://store.apple.com/us/product/MA348LL/A?aosid=p204&siteid=1503186&program_id=2554&cid=OAS-EMEA-AFF&tduid=a9036365524f205aa2f358074946bf81&mco=MTY3ODQ5OTY#overview Basically, I'm worried about buying a battery, because I'm not sure if it will fix my problem, of only having thirty minutes to use my computer when it's not plugged in. Is there a way to figure out how worn out my battery is, by clicking something or some icon? Clicking the icon in the top right, doesn't seem to be quite what I'm looking for because that just says Better Energy Savings Normal Better Performance I don't know what that means. But more importantly, I'm pretty sure it doesn't give me the information I'm looking for. I want to know how good of shape my current battery is in. thank you very much for your help!