I have a mid-2011 MBA 11" with 4GB and 1.8 GHz i7. Back then it was advertised with 5 hours of battery life, little did I know that these 5 hours were measured with the standard i5 core and don't apply for the i7 I chose at checkout. Since the beginning the battery never lasted longer than max 3 hours during very light browsing or note-taking in MS Word, quickly it decreased to 2 hours and therefor forced me to constantly recharge my MBA throughout the day. In the end I had over 3500 charging cycles in 3 years and unsurprisingly the battery eventually blew up and dislocated the trackpad and the bottom row of keys. Apple replaced the battery at their cost admitting that the mid-2011 batteries never truly harmonized with the i7 cores. Still, even the 4 hours on the new battery are not ideal for an ultra-portable machine, so I'll buy a new 2014 MBA 11". I want to max it out again with 1.7 GHz i7 8 GB but I'm wary that this might affect my battery life yet again. Any owner of this combination around? Do you still get your 9 hours with Wifi, light browsing, word processing and something acceptable (I'm thinking 4 hours+) during editing/rendering with iMovie? Thanks for your help!!