I used to have a white macbook from 2007. I replaced the charger a couple times so the charger was probably purchased in 2009. I just for a new macbook pro. My question is, is it safe to use the old charger. I know they look different but the connection seems to fit into my laptop just fine. I'd love to use it as a second charger so I can leave one plugged in and one in my bag but I don't want to risk anything happening to my laptop if the power level is different or something.