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
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2pcs iConstel assembly for GARMIN 011 01834 00 7.2V 2200mah 16.28wh Battery GPSMAP 620 640 Li Ion rechargeable Battery pack|Rechargeable Batteries| - AliExpress