The battery lasts for 2 hours or less now. In the Battery Health App it says that my battery health is 85% (but sometimes it drops to 56%,idk why) and it is 6.1 years old, lolz. I think i bought my MBP in Dec 2008. Is it ok to leave my MBP off without a battery for a long time ? Does this make the battery rest or something ? My MBP is the high end one and it comes with 2 GPU, Will disabling one GPU be useful ?