Introducing the Garmin® eTrex® 20x and 30x Outdoor Handhelds | Business Wire
Gomadic High Capacity Rechargeable External Battery Pack suitable for the Garmin etrex 10 20 30 - Portable Charger with TipExchange Technology - Walmart.com
Amazon.com: Gomadic Portable AA Battery Pack Designed for The Garmin etrex 10 20 30 - Powered by 4 X AA Batteries to Provide Emergency Charge. Built Using TipExchange Technology : Electronics