I just bought a macbook as a replace for my five year old iBook. I was planning on purchasing a second power adapter. I like the size and more rugged connector on the Macbook Air power adapter. I have searched around and it sounds like the Air adapter will work with a MacBook but I am not completely convinced. I understand that this adapter will only charge or power the unit but not both. Has anyone tried their Air adapter on a MacBook? Could an Air owner tell me the voltage and current rating (outputs) on their adapter?