I recently upgraded my last-gen macbook to a macbook pro 13". I have a feeling there's something wrong with the battery however. On my old Macbook, whenever i let the battery drain completely (After I got the 10 minute warning message), the macbook went into hibernation until I plugged it in. However, on my Macbook pro, whenever I do the same it doesn't go into hibernation. Is there something wrong with my battery or have apple changed how this works?