New Portable Battery Chargers from Powerocks, Just Mobile, and Lepow — Nemo Memo Comparison Lepow Moonstone 6000 (comes in several attractive colors) $70 Just Mobile Gum++ (comes in black, white, and silver) $90 Powerocks Stone 3 (white only) $100 Portable USB battery chargers are getting smaller, smarter, and better looking. Everyone needs at least […]