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A button cell, also commonly known as a button battery or coin cell, is a small, round, and flat single-cell battery named for its distinctive shape resembling a button or coin. Typically ranging from 4.8mm to 30mm in diameter, these compact power sources are designed for devices that require a small form factor and low power consumption.
Button cells are available in various chemical compositions, including alkaline, silver oxide, and lithium, offering different voltage outputs and performance characteristics. They are widely used in everyday electronics such as wristwatches, calculators, hearing aids, and car key fobs, as well as in critical medical devices like pacemakers.
One of their most notable advantages is their low self-discharge rate, allowing them to hold a charge for years while in storage. Additionally, modern button cells are designed with excellent sealing to prevent leakage, ensuring the safety and longevity of the delicate electronic devices they power.
