iPhone Battery saver options:
An article at ZDNet has some great advice.
These are the headings, just read the article for the full information.
Turn off AirDrop except when needed (iOS 7)
Limit dormant apps from using your battery power in the background
Disable auto app updates, and just do it manually
Allow updates when you’re on Wi-Fi only by deselecting Use Cellular Data at the same time.
Block some callers from contacting you
Prevent your iPhone from ‘learning’ your frequent locations
Turn off ‘parallax’ motion user interface
Stop Siri from always waiting for you and listening ALL the time, just in case you speak, and consuming your battery. Press home when you need to wake up Siri.
Prevent Spotlight Search from indexing unnecessary files
Tame your notifications (and your backlit display)
Turn off auto-brightness; adjust manually
Don’t use moving ‘dynamic’ wallpapers
Disable location-related system services
Switch from ‘push’ to ‘fetch’ email
Enable Wi-Fi while you’re at work or home
Switch off Wi-Fi, Bluetooth when you’re out and about
Disable 4G (and LTE) connectivity
Reduce auto-lock period to switch off backlight
Disable unnecessary vibrations
Regularly close unused or dormant apps
Check for iOS updates regularly for unfixable bugs
Be aware of where you put your iPhone
Adjust human behavior: don’t check your phone as much!
Cheat! Buy an external battery
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