Google Glass Is Doomed : Uh-Oh, Short Battery Life and Heat on the Face among other concerns, subtext, LCOS sucks : But those Forktruck Drivers are gonna need such a device eh? Yup.

5. Battery life. Right now I want to use Glass for journalism. It works pretty well for that, if you watch my Sarah Francis video I filmed on Glass. But when doing video the battery only lasts 45 minutes AND it gets very hot.

http://www.huffingtonpost.com/robert-scoble/google-glass-is-doomed_b_4603451.html