How to maximize iPhone 4 battery life?

I'm trying to set up a hidden camera to see if my brother is messing up my room or taking stuff, because my book disappeared, so how can I maximize its battery life? It recently ran out in 1 hour when I attempted to set up my camera. It had airplane mode and darkest screen setting. Any other ways to get it to last for 4-6 hours at least?

Buy one of those cases for you iphone that is a charging case.

Buy a charging case, like the other person said.
1. Turn off some of the push notifications
2. Turn the brightness down and auto-brightness of
3. Kill all apps that you are not using.
Turn Wi-Fi, Bluetooth, and some of your location services off.
Hope this helps!

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