Months ago I drowned my MacBooks keyboard in water and it died. I'm using an external keyboard now the Mac works as before. However, there is this interesting feature that if I just close the Mac (sleep mode?) then it runs hot and the battery drops to 0% within about 15 Minutes. So now if I don't use the Mac, I just keep it open so the battery doesn't go away. What might be the explaination for this new property?