The battery life estimate on Apple's site is 9 hours for the 13" Retina MBP and 12 hours for the 13" Air. The Air will run longer, but they probably both run l

The battery life estimate on Apple's site is 9 hours for the 13" Retina MBP and 12 hours for the 13" Air. The Air will run longer, but they probably both run long enough. Eric Griffin seems to have different needs than I do. The relevant comparison for me is 13" Air with 256GB flash, 8GB RAM, 1.7GHz i7, and 12 hours estimated battery life for $1,549.00 or the 13" RMBP 256GB flash, 16GB RAM, 2.4GHz i5, and 9 hours of estimated battery life for $1,699.00. (Haswell i5s have hyperthreading, so the upgrade to the i7 does very little). This is $150 for twice the RAM, a great display, and 3/4 the battery life. It really does make the 13" Air seem silly.