[link|https://www.ifixit.com/User/4173151/Sonny+Medrano|Sonny Medrano|new_window=true] looks like it's possible but a royal PITA. Anyhow, go through the service guide published by Microsoft [document|27530]and check [https://www.youtube.com/watch?v=rOhFfa94dg8|this video] as well (yes 13" model but looks like the step are very similar) and see if that is something you want to tackle. I have not yet found the right battery. Microsoft will charge you $400 for an out-of-warranty Battery Replacement service. Dang that is nice of them :-)