1) Keep your device ON

Surprisingly, just turning the device ON uses a lot of battery.

2) Turn WiFi Off

Along with Safari browsing, WiFi uses a lot of battery (your battery may not even last 3 hours!). 

3) Set Auto-Lock

You can do this in Settings>General> Auto-Lock and set it to 1-3 minutes. The longer your screen is turned on, the more battery it uses.

4. 4)Use ‘sleep mode’
   

Putting your device into sleep mode immediately turns off the screen, which saves battery similar to using auto-lock. Get in the habit of doing this after every use.

5) Keep Brightness Dim

You can do this in Settings>Brightness. The dimmer the screen, the longer your battery will last.

6) Turn Auto-Brightness Off

You can do this in Settings>Brightness. This prevents the device from increasing the brightness level and allows it to use less resources due to lack of monitoring.

7) Check email less often

You can do this in Settings>Mail>Fetch New Data and set to manually or hourly.

8) Turn EQ Off

You can do this in Settings>iPod>EQ. This will use less resources to monitor EQ.

9) Turn BlueTooth Off

You can do this in Settings.