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http://www.asus.com/zentalk/forum.php?mod=redirect&goto=findpost&ptid=25133&pid=1437678 best way to save battery according to ASUS

1. Lower screen brightness

An overly bright screen consumes more power and can be harmful to the eye. To adjust brightness, swipe down from the notification bar twice and use the slider. Extend your battery life, and protect your eyes while doing so!

2. Shorten screen timeout time

To squeeze more juice out of your battery, you can shorten the screen timeout time so that your phone goes into sleep mode faster. Try changing the time from the default 1 minute to 15 seconds. To change this setting, tap Settings > Display > Sleep.
To change Cover View screen timeout time, go to Settings > ASUS Cover > Automatic sleep.

3. Trim unnecessary background apps

Prevent unnecessary apps you don't need from running in the background and consuming your battery by using Auto-start Manager. Tap Auto-start Manager to select apps you want to discontinue from running.

4. Use Smart-saving Mode

ZenFone 2 has many extremely useful battery modes, one of which is Smart-saving mode. It provides extra toggles for brightness, a feature that turns off internet, and an Extend Standby feature that lowers battery consumption by efficiently managing your push notifications when your phone is in sleep mode.
Tap Settings > Power management > Power Saver > Battery Modes > Smart-saving mode.

5. Tap Boost from Quick Settings

Have you ever wished for a single button that solves all your problems? When you tap Boost, not only does it make your phone faster, but it also lowers battery consumption. Swipe down from the notification bar twice to find the Boost button.

6. Choose Wi-Fi over 3G/4G Data

Using Wi-Fi instead of a data connection will use less battery because your phone doesn't need to constantly search for the network.
To turn on Wi-Fi, swipe down from the notification bar twice and tap the Wi-Fi icon.

7. Turn off Location Services, Bluetooth, and NFC

Don't be lazy! Turning off these services when you're not using them can extend your battery life. To turn these services off, swipe down from the notification bar twice and tap the Location, Bluetooth, or NFC icon.

8. Set up an Auto-switch mode schedule

You can't be using your phone all the time! Set up a time interval in Auto-switch mode to automatically switch to a lower battery consumption power mode when you're not using it. To do this, tap Settings > Power management > Power Saver > Auto-switch mode. After enabling this feature and choosing your starting and ending times, we recommend setting it to change to Ultra-saving mode (the default).

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