I have a first generation MacBook Pro. I closed the laptop (putting it to sleep) without shutting down. Power was not plugged in. Then I accidentally left it like that while I went on vacation for over a week. When I got back, the MacBook Pro battery was completely dead. It won't charge and OS X reports as there being no battery installed, when it's clearly in there. I realize I shouldn't have left the computer in sleep for so long, and I didn't mean to, but I'm surprised that this would leave the battery dead and useless. Has anyone ever heard of this happening? Or is this just common knowledge for laptops? There is no warranty left on the machine, let alone the battery. And my battery didn't qualify for any of the recalls.