Have you ever excitedly bought a new smart device, such as a cool key tracker, a sophisticated thermometer, or a stylish desktop clock, only to be stunned when installing the batteries? Looking at the small battery compartment in my hand, and then at the dazzling array of batteries on the shelf, a series of questions popped into my head: Should I use the one that looks like a small button, or the flat cylindrical one usually called "CR2032"? They seem pretty much the same? Should I just buy any one that works? Hold on! This choice is far more important than you think. Choosing the wrong battery can lead to anything from poor device performance and reduced battery life to potentially damaging your beloved devices. Today, this practical guide will thoroughly clarify the differences between lithium manganese batteries (represented by CR2032) and the broad family of button batteries, helping you overcome your choice paralysis and become a "power expert" among your friends!