12 hours ago I installed a new battery ordered via eBay from Hong Kong (I have a 13" MBP Unibody mid '09). The status of my old battery was "replace soon". It would lose charge pretty quickly and suddenly jump from 20% to 0% and sleep/hibernate. I replaced it with a new battery, charged it fully (it was at 50% when it arrived) and then decided to deplete it fully. Upon draining the new battery for the first time, it suddenly jumped from 12% to 0% and went to sleep. I powered it back up when plugged in and its status now is "service battery" - What gives?! I replaced it because a long time ago my old battery became bloated- it literally started taking up more volume, pressing against the aluminum housing of my computer and also restricting the clicking ability of my trackpad. You might ask why I never got my battery serviced over the course of two years while I had Applecare: the truth is that I didn't have enough time. My Macbook is responsible for my income and I refused to part with it for even a day.