by Lisa A. Grimaldi | October 01, 2013
Boostcase's "Double Shot" Hybrid Battery ($99.95; features a slim-fit, snap-on design with detachable battery that injects 150 percent more juice into an iPhone 5 (similar models are available for iPhone 4 and 4s). Powerocks Magicstick ($49.95; provides enough power for two full emergency charges of any smartphone, tablet or mobile device.