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Second, control which apps are visible on the Lock Screen by switching off View in Lock Screen … the more you have showing, the more often your screen will flick into life, draining precious battery power.
Another possible battery-eating culprit in iOS 5 is Diagnostic & Usage data:
Settings > General > About > Diagnostics & Usage
Set this to Don’t Send.
Don’t go to the cloud
iCloud syncing takes a lot of juice too. Turn off what you’re not using at:
Settings > iCloud