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Don't forget power saving mode
Most phones have a special mode that can be toggled on to stretch the longest time possible out of the battery. Power saving mode does this through a number of techniques such as turning off different radios (wi-fi, Bluethooth) among other things.
Power saving mode has a significant impact on system performance so you don't want to have it enabled all the time. Instead, turn it on when your battery level is dropping low and you have a while to get through the day. Some phones have a setting that lets you program a battery level, say 30 percent, to enable power saving mode automatically.
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.