Button Cell Battery, 78mAh, Lithium
From Amazon
Ring Automotive GP CR1620 Electronic/Key Fob 3 V Lithium Battery
DFB Sound & Light Warehouse
GP Batteries GP Lithium Cell Battery CR1620 DL1620 3v 16 x 2.0mm
Conrad Electronic
GP Batteries Button cell CR 1620 3 V 1 pc(s) Lithium GPCR1620