So i just recently purchased the 13 inch Macbook Air. I also own a 17 inch MBP that comes with the 85W mag safe power adapter, whereas the one provided with the MBA is a 45W mag safe adapter - my question is can the they both be used interchangeably and will using the 85W adapter on my MBA cause any damage to the battery by overcharging it too rapidly? I can't seem to get a straight answer out of Apple other than saying they would recommend using the appropriate adapter that was provided with the computer. I don't really want to carry around two chargers....any feedback is appreciated