Try these tips for squeezing the last bit of juice out of your cell-phone battery from Rob Shaddock, Motorola’s chief technology officer: (1) Wait until you have a strong signal; your phone will use much less energy. (2) Turn off features like display backlighting. (3) In a strong-signal area, don’t turn off the phone to rest the battery; powering it back up uses more energy than leaving it on standby. (4) Make a quick call instead of sending a long text message; typing drains the battery quickly.