How to save your phone percentage on your iPhone?

Other than turning your brightness down and putting your pone on airplane mode please

If you're using ios7, turn off the motion thing where you think the app "moves".
You can see it as "reduce motion" in settings.
Avoid using animated background too.
My Bluetooth is also off and so is the automatic update/fetch for apps and e-mails.
If you're not using your data, turn off the 3G/4g because when it's turned on, your phone automatically search for signals.