Okay, so I've been trying to decide whether to get an iMac or a MacBook, but I've figured I'd need the portability every once in awhile and so my only choice would be the MacBook. However, most of the time I'd like to use it in a desktop-computer kind of way. I guess I'd leave it plugged into it's charger, closed, connected to an external monitor, and whenever I needed it I could wake it up and do everything normally. But my concern is the battery... The iMac in my home is on all day and night, barely ever restarted, and it's been that way for like 5 years. But I'm guessing there's a big difference between what's powering that and what powers a MacBook. I don't know too much about battery technology, so I'm asking here. Would leaving a MacBook on (on sleep most of the time) --- just like an iMac --- lower it's overall battery lifetime? Would it damage anything else in the computer? It'd be plugged into it's MagSafe connecter, connected to an external display, 24/7.