nappiparisto

A nappiparisto, also known as a button cell or coin cell battery, is a small, flat, and usually cylindrical battery. They are commonly used to power small electronic devices. The name "nappiparisto" in Finnish translates directly to "button battery." These batteries are designed for low-drain applications where a compact power source is required.

The construction of a nappiparisto typically involves a positive electrode, a negative electrode, and an electrolyte. The casing is often made of metal, with the positive terminal usually being the flat, exposed top surface and the negative terminal being the bottom. Common materials used in nappiparisto include lithium, silver oxide, alkaline, and zinc-air. The specific chemistry determines the voltage, capacity, and lifespan of the battery.

Examples of devices that commonly use nappiparisto include watches, calculators, small remote controls, key fobs, medical devices like hearing aids, and some electronic toys. Their small size and sealed design make them convenient and safe for these applications. However, due to their small size, they can pose a choking hazard to young children and should be handled and disposed of with care. Recycling is encouraged for many types of nappiparisto to recover valuable materials and prevent environmental contamination.