Garmin Charge Power Pack [010-12562-00] at BikeTiresDirect
Gomadic Intelligent Compact AC Home Wall Charger suitable for the Garmin EDGE 520 - High output power
Amazon.com: Gomadic Portable AA Battery Pack Designed for The Garmin Edge 800 - Powered by 4 X AA Batteries to Provide Emergency Charge. Built Using TipExchange Technology : Cell Phones & Accessories
Garmin Charge Power Battery Pack Mounting - YouTube
Tutorial - Edge Series: Using Garmin Charge Power Pack - YouTube