I think Apple's war to replaceable / serviceable batteries reached pathological levels: ok, for some technological limitations you have to use that unpractical umbellical-corded battery, for god sake, transform it in a feature, permitting the use of pluggable power banks, people can reuse those they have around without having to be "plugged into the wall with the 5-foot cord". Maybe they could add a little buffer battery with, let's say 5 minute autonomy, permitting "hot swap" features, hopefully user replaceable. About the weight : is that (IMHO disturbing) external-eye-reproduction feature necessary ? I find it useless and I think a screen reproducing my eyes externally consumes an important amount of energy , that for a 2 hour autonomy device could be important. About the applications, reading this article I'm sure: the object lacks of any "killer app" and friends, cooking with the visor on make me laugh : it's like you are about to solder the food pretending it's carbon steel ! In my day-to-day tech needs, I have instead space for some good AR glasses, like the old Google glasses: for example, live translation, being in a foreign country could be valuable something able to translate at command what I have in front of me, being a biker, could be valuable be able to read data from motorbike without having to move the eye from the street, same for navigator directions, etc. Other ideas? An app that suggest me places around worth to visit. I use oscilloscopes and other lab equipment, could be priceless to have the data accessible without moving the sight from the PCB, etc, etc, etc.