Here's the story... I use my rMBP 13" (Late 2013) at my desk at work all day every day, plugged into power. During the week I don't use the MBP on battery very much, so it ends up charging every morning from 99% back to 100%. I know for a fact that topping off the battery every day like this isn't good for it. I'd rather not charge it back up to 100% every single day! Is there any "secret" command that can prevent charging the battery if it's not below a certain threshold? I'd love to set that threshold to 90% or so.