Renata CR1620 Button cell CR 1620 Lithium 68 mAh 3 V 1 pc(s) | Conrad.com
Amazon.com: Duracell 1620 3V Lithium Battery, 1 Count Pack, Lithium Coin Battery for Medical and Fitness Devices, Watches, and more, CR Lithium 3 Volt Cell : Health & Household