Resolving battery drain with iOS 5 (not 5.0.1)

Hi
New iPhone user (first iPhone). Unlocked 4s 64Gb. iOS 5 United Kingdom
NOT impressed with battery drain so far and reluctant to "upgrade" to iOS 5.0.1 On standby (most services set to "off") phone has decent life (looking at about a week bofore the battery dies) but as soon as I start using the phone - eg browsing over WiFi, battery drops like a stone (4% in 20 minutes).
I can see lots of folks upgrading to 5.0.1 and doing a full battery drain, full reset & set-up as a new phone and this seems to resolve some issues.
My question is, does this same technique work with iOS 5??
Hopefully 5.0.2 (or whatever it is called when released next week) will sort this out - otherwise the 4s goes back to store for a refund.
Any comments gratefully received.
Cheers
RB

I have also noticed what appears to be decreased battery life after the upgrade, though not this bad. Seems many people are noticing problems.
I noticed and changed a couple of settings that seem to have helped.
- first, fully shut off the phone and then turn it back on - i read online this helped some, immediately after the update.
- in mail settings, for the icloud account (I dont use this but it was configured by default) check the sync settings . it defaults to push, which takes more power. you might want to disable push and set to fetch for this and any other accounts you have, for additional power savings
- in settings, location services, scroll to the bottom and tap system services : All of them are defaulted to on. I turned off location-based iads and setting time zone since i dont need those. (I also opted out of the diagnostics and usage as part of the setup, but it was set to on in this screen - i left it on for the time)
- also in settings -- location settings: check the list of apps and verify that only the ones you want, are enabled
These few settings seem to have improved things

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