Mataji Electronics

A primary battery or primary cell is a battery (a galvanic cell) that is designed to be used once and discarded, and it is not rechargeable unlike a secondary cell (rechargeable battery).

Button cell batteries and lithium coin cell batteries are both circular-shaped, metallic, and small enough to swallow. They are used to power many household items. Button cell batteries look like small round buttons. They often are used in hearing aids and watches.