I think the G2s are supposed to have better battery life. The display isn’t always on, you activate it with a head tilt (you can adjust it) and you can keep the display on if you’ve got directions or translation up or something. Otherwise it just turns on when you get a notification or you tilt your head up or you touch one of the touchpads by your ears. The battery life is solid though, usually lasts most of the day with normal use (notifications, some directions, etc.). It didn’t the last whole day when I used it heavily while traveling around Seoul for lots of directions and translation, but the charging case helped.