NEW GARMIN EXTERNAL Battery Pack for Edge 1030/1000/820/520 + mount + cable. - £99.00 | PicClick UK
Synergy Digital GPS Battery, Works with Garmin Edge Touring+ GPS, (Li-Ion, 3.7V, 1000 mAh) Ultra High Capacity, Compatible with Garmin 361-00035-00 Battery - Walmart.com