Bummer. It just died on me @7hrs... something must have gone wrong. It's saying 40% of usage was Android OS. DAMMIT.
When I purchased Advanced Task Killer Manager, I took my battery life from 3 hours to 6 hours, so doubling it....I am on my phone alot though...Probably have 100 calls in the last 30 hours. I would recommend this app to anyone who is looking to extend battery life
Widgets run as services which use resources continually.
If you don't believe me.. go to settings--->applications---> running services and see all your widgets running. Services kick in an run anytime the phone is on.. you don't have to activate them manually.
Get a task killer or manager and see what all is running from a fresh reboot, now imagine not rebooting your phone for a week or more.
Every time I open almost any app, its still runs "if I let it" in the background.
The Second Mouse gets the Cheese!