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Turn off phone vibration
Some folks don't realize it but having the phone vibrate for calls and notifications is a big drain on the battery. As nice as it may be to have the ringer turned off and vibrate enabled, if you need to stretch the battery life on a busy day then turn off the vibration.
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.
No haptic feedback
Most Android phones have haptic feedback that gives a little vibration when keys are pressed on the keyboard and at certain other times. Just as vibrating when receiving a call takes a hit on the battery, so does haptic feedback.
If you don't absolutely have to have it, turn off the haptic feedback.