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
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Back Cover For Garmin Edge 800 Shell Bicycle Speedometer Back Cover With Battery/Without Battery Replacement - AliExpress
Replacement Battery 361-00035-00 361-00035-03 361-00035-07 for Garmin Edge 800 810 New Battery 1100mAh +Tools 3.7V - AliExpress
Battery for Garmin EDGE 800 GPS
Garmin Edge 1040 Solar Claims up to 100 Hours of Battery Life - BIKEPACKING.com
Garmin Edge Charge Power Pack – HeartRateMonitorsUSA.com
Garmin Edge 800 adds NP/IF/TSS, left/right power, tons more data fields | DC Rainmaker