As one of several new device-agnostic battery solutions for iPod and iPhone users, Mophie's Juice Pack Reserve ($40) takes a different approach from its prior svelte case-slash-power solutions. Made from metallic silver and matte black soft touch plastics, reserve is designed to be carried around separately from the iPod or iPhone, potentially worn on a belt with an included carabiner hook, and attached only when extra power is really needed. A retractable…
