Synergy Digital GPS Battery, Works with Garmin GPSMAP 620 GPS, (Li-ion, 7.2V, 2200mAh) Ultra High Capacity, Compatible with Garmin 010-11025-03, 011-01834-00 Battery - Walmart.com
Garmin GPSMap 640, hands-on #1 - Panbo
GARMIN GPSMAP 620 LAND & SEA GPS NAVIGATION SYSTEM | Sale-Marineshop.com