The iPhone's flash is pretty fast.
My battery life was much worse after upgrading. I then did an OS install with the phone in DFU mode, and then restored settings and synced. Still same battery usage issues. Next I turned off a lot of features, and that seemed to have helped. There are a lot of reports of battery life issues. Maps is getting a lot of heat (I haven't noticed anything "bad", but I've not used it much). Auto brightness doesn't seem to work, or they've changed the way it works.
Currently I'm running some diagnostic software to gather usage battery usage data.
From posts I've read on other forums, various settings changes or even setting up he phone from scratch has resolved the issue.
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- Josiah Stamp
Every time I see an adult on a bicycle, I no longer despair for the future of the human race.
- H.G. Wells