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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.