1st Gen MacBook Air Charger: Will it work with Late 2010 MBA? The original MacBook Air's charger looks a little different than the L-connector MagSafe 1 that the later gen Macbook Air's have.  Here's the first gen:



It looks like the actual plug interface is the same, just the external housing is different.  The wattage is also 45w.  

Are they interchangeable?

My MBA: Late 2010 13 inch.
Yes, this will still work. The situation you want to avoid is using the incorrect wattage.