Replenishing the battery in your cell phone or tablet is convenient and easy with the AtomXS Emergency charger. This handy item attaches to your keychain or fits inside your pocket or purse, and can be a real lifesaver for those times when your devices are dead or dying (such as calling AAA about a flat tire or while seeking directions to a destination). The AtomXS’s high-density battery cell packs plenty of power for its diminutive size: Two-plus hours for the base unit that sells for $35, and three-plus hours for the upgrade version that costs $40. Order them from

Big charge from a tiny device