Hello, I have a very old macbook pro, purchased in early 2007 and thankfully I have upgraded my mac since then, however I still have files on this mac and get on it every so often. I just noticed the bottom swelling and saw that it was the battery, which is becoming unglued. When I have the laptop plugged in, the battery doesn't need to be used, but if I were to unplug, obviously I'd be screwed. So should I save my files on an external hard drive and ditch the mac or should I invest in buying a new battery? If you need more info on the mac I'm referring to or have any other questions that could help you with your answer to me, please ask! Thank you!