I just recently put together an external display setup for my macbook air. It works fine in clamshell mode, but I wonder what to do when my macbook reaches 100%? 1) How safe is it to just leave the macbook charging at 100% in clamshell mode while I continue with my work? 2) Should I disconnect the power and move to dual-display (macbook+external monitor) instead? What are your habits with regards to this issue? Thanks all.