CR2016 batteries are standard 3V lithium batteries that are commonly used in everyday devices like watches, car keys, electronic toys and calculators. The 'CR' code means it is a 3V lithium manganese dioxide battery, with the number standing for the dimensions. CR2016 batteries are 20mm in diameter and 1.6mm in thickness. You'll find an extensive selection of CR2016 batteries from the world's leading manufacturers including Duracell, Panasonic and Varta.