Unlike humans, who operate on a delicate balance of ginseng, vitamin D, and middle-school history textbooks, most important gadgets harness battery power. Take advantage of the universal life source with today’s Groupon: for $10, you get $20 worth of batteries and more at Interstate All Battery Center.

Interstate leads the charge in power outposts, providing lifelong Texans and reserve-power road trippers with brand-new batteries for their cell-thirsty gadgets and equipment. With a vast storehouse of more than 16,000 varieties of power pod, Interstate carries batteries for many brands of digital cameras and flashlights to restore drained Maglites after Tony Award–winning shadow-puppet productions. Household powerables are also available, including 24-packs of Workaholic AAs for bulk buyers ($12.99) or 2-packs of Duracell 9V alkaline batteries for metronomes possessed by surprisingly funky eighth notes ($7.99). Since 1952, old used batteries have found comfy retirement at Interstate’s recycling center, allowing their former owners and well-meaning grandchildren to rest easy.