non-user-replacable battery in an otherwise average (specs wise) ultrabook aiming for the high-end premium market (likely due to the Kirabook name). looking at the competition in the ~$1500 ultrabook sector, all the other ultrabooks seem to look thinner in picture. so my bet would be that Toshiba stuffed a giant battery into this, filling up every crevious of space available. I wouldn't be surprised if nothing is user-replacable in this device