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Turn off unused radios
Android phones are chock full of radios, including wi-fi, Bluetooth, and GPS. Each of these radios hits the battery so it is prudent to turn them off when not being used.
If you don't use a Bluetooth headset then it makes sense to keep Bluetooth always turned off. Make an effort to leave wi-fi off until you're in an active hotspot.
GPS can be turned off when not using the navigation feature of the phone.
You can access the radio toggles in settings, and many Android phones have a section in the notification drop-down as shown above.