There are many small, handheld electronic devices/gadgets at home, do you know what kind of battery it uses? Usually, these devices do not take the AA or AAA batteries, but uses a small and round battery. This type of battery has many different kinds of uses, from small LED flashlights, digital thermometers, calculators, laser pointers and etc. The AG3/LR41 button cell battery is a very common model for the standard 1.5V silver oxide battery, which is used to power watches and many other small electronic devices. As an alkaline button cell battery, it has high volumetric energy density and the ability to deliver this energy at relatively high current drains. This is ideal for using in watches, cameras, thermometers, and other devices which require high precision and stable power.