I fully recharged my new Gio Thursday evening and it was done at 23pm.
Today there's still around 25% battery lifetime left.
I can't complain with around 5days of battery time... but ok, I'm not a hughe mobile phone user - a few calls and sms' a day.
I have "live wallpaper" enabled but screen time out after 30sec, and I disabled wifi, bluetooth and mobile network internet services. I also have fairly low screen brightness - it think it's clear enough at around 20%.