Button cell batteries

Button cell batteries, also known as coin cell batteries, are small, circular batteries that are typically used to in airsoft to power Red dot sights but are also used to power other small electronic devices, such as Swatches, calculators, and hearing aids. They get their name from their shape, which is similar to a button or a coin. Button cell batteries are typically easy to install and replace, and are often used in devices that do not require a lot of power. They are also relatively inexpensive compared to some other types of batteries, making them a popular choice for many electronic devices.