Amazon.com: Synergy Digital GPS Battery, Works with Garmin Drive 51LMT-S GPS, (Li-Ion, 3.7V, 1100 mAh) Ultra High Capacity, Compatible with Garmin 361-00056-00 Battery : Electronics
LiPo 3.7V Li Ion Lithium Battery 1S JST-PH 2.0 Male Tablet GPS with BMS | eBay