Hi I got my imac about a month ago and I'm still getting used to it. I work from 8-5 and use it everyday when I come back from work. Do people usually leave their keyboard & trackpad on all the time or do they turn it off and turn it back on every time they're using it? I turn them off after I shut down my imac but I'm getting tired of it. Would the battery drain a lot if I just leave it on?