Keeping your cell phone and other portable electronics fully juiced can be problematic if you’re nowhere near a plug-in power source. For that reason the new Brunton Revolt 9000 power supply can literally be a lifesaver. This shockproof and waterproof all-weather energy source has a built-in lithium-polymer battery (good for charging the equivalent of six smartphones) that can be replenished through an AC adaptor. Restore also includes a three-in-one adaptor cable for linking with USB, Lightning and 30-pin devices. If the Revolt ever breaks, the company says it will fix it or replace it for free. Pick one up for $100 from www.brunton.com.