Duracell CR2032 3V Lithium Battery, 2 Count Pack, Bitter Coating Helps Discourage Swallowing 004133303534 - The Home Depot
How to test a 3-volt lithium battery with a multimeter - Quora
It Just Got Easier to Convert Lithium-Ion Battery Voltage to 3.3V with this Efficient Single Inductor Synchronous Buck-Boost Regulator | Analog Devices