"Do you know where there is an outlet to plug in my phone?" you ask as you scour the lower part of the wall for a plug. "Does anyone have a charger I can borrow?" you ask friends at the bar as your phone warns you of low battery and you start to sweat.
OK, maybe you haven't been in those exact situations, but you've experienced something like them: Your phone battery is about to die and you wish you had saved power when you had the chance. Or you just wish you had power now.
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