Update on battery life after my first day of proper usage:
So far its been on for 11h 20m and i have 26% left.
Ive mainly being using it just for facebook, twitter & internet, also a few minutes of video and a few minutes of games.
I have also being using face regonition to unlock, so the front camera comes on every time i try to unlock it.
I have the screen brightness set to max & all syncing options set to default & have been connect through 3G all day.
So i have probably used it slightly more than normal (being a new phone and all) but nothing major, so it comes up alot shorter in comparison to my nexus one as I would normally get to about this time of day with 50-60%