I'm also pretty satisfied with battery life, it is roughly the same as yours or even few days longer with light usage. I guess that standby time could be as long as 7-8 days.

Reflashing made the biggest change, as cpu won't get any load when idling.

edit. I was really losing my mind with this battery life issue when I got the phone, it was the biggest flaw in the device. How many user are there who still have to charge their phones all the time