Remember those water bottles you responsibly recycled last week? Their next destination might just be inside one of the Motorola P793 Back-Up Battery Charger, from AT&T. This portable auxiliary battery pack is made from 25% recycled plastic materials. It should give any device 5 extra hours of talking time, and has two ports, so it can charge two devices at once. It only works with USB devices, though, so iPhone 4S users with weak battery life will still need to look elsewhere.
The Motorola P793 Back-Up Battery Charger is available now for $40 from AT&T stores, or from their website.