Hi everyone, I'm an happy owner of a late 2013 13" rMBP. I use it everytime (24/7) plugged with an external monitor and using dual-screen functions. Sometimes I unplugged to take my laptop in travel with me. I've got 2 simple question: - Using rMBP plugged with external monitor can give me a lower battery life perfomance (hours for cycle)? I've noticed a difference of 1/2h for cycle...normal? - Using the laptop everytime plugged with external monitor, can I damage the integrated GPU or somenthing else? Thanks a lot for your replies and sorry for my terri-bad ENG.