Its a while since the last post, but did you fix it yet?
I bought a new 808 last week, and of course took all the immediate updates happily. Was horrified by the 10% per hour drop in battery level..
Since then I have tried a lot of things, read a lot of unhappy posts, and re-learnt a lot about Symbian since my E61 days
I currently have good results! But I'm not sure what really fixed it for me
I removed all of the games, Adobe Reader, in fact almost everything in the app drawer that allowed removal, including Weather-, clock- and the new FP2 widgets.
I have qooBattery widget as that shows me the dynamic milliamps used, and the Text Clock widget.
Opera Mobile, cuteBox and Tweetian are the apps I use. I found a 1.26 version of Skydrive to upload photos to the cloud when taken (with a mifi in my pocket
The app which is doing me most good (I ythink) is Battery Power Saver, which I set to either silent, meeting, or offline for max savings, and App Stop which allows me to keep watch for anything unusual.
Hope that may help someone with battery troubles after the FP2 update..