My laptop goes to 5 percent and dies super early. Thought this was suspicious and that the battery just needed calibrating. I decided "meh, why not" and just pushed the power button after it hibernated. It turned on surprisingly and stayed on. And then it went to 0% and went lasted the appropriate time. The battery actually died which i assume is very bad and I can't get that hidden percentage back. Now its rapidly dying and drains while sleeping. How can i rectify this?