A very small amount of mercury - on average, less than 3 mg. - is used in silver oxide and manganese alkaline button-cell batteries to prevent a gassing process that would otherwise corrode the battery and the watch or clock that contains it.

Button-cell batteries should be recycled properly by having a professional watch technician remove the spent battery from the watch or clock and forward it to an appropriate waste management service for recycling. Consumers are cautioned not to remove spent batteries themselves because special equipment is often needed and any damage resulting from unauthorized service will normally void the product warranty.

>>Click here to how to recycle your watch battery