For Medical Equipment Giga-tek 3V CR1620 Lithium battery
Panasonic: CR1616 3V Non rechargeable Round Lithium Coin Cells
Panasonic CR-1620 Lithium Coin Battery 3v - Pack of 5 Provide Long Lasting Power in a Variety of Devices,from keyless-Entry fobs to Toys : Amazon.in: Toys & Games
Duracell Specialty 1620 Lithium Coin Battery 3V, Pack of 5 (DL1620/CR1620) Designed for use in keyfobs, Scales, wearables and Medical Devices : Amazon.in: Electronics