An apple, with its juice, can act as a power source for your phone. Sure, an apple alone might not be able to produce enough energy to charge it all the way up. But there’s one simple way of providing the power than your phone needs without running down that little battery too much: just use another device to charge it. Use someone else’s PC at school or work and plug the charger into the USB port on their machine while you’re studying or viewing presentations from them. Or find a friend with a laptop who agrees to let you use his machine’s independent charger cable instead of relying on Mom’s computer in her basement or Dad’s Blackberry in his car for important communications.