The Duracell DL1220 with Battery is a lithium powered 3-volt CR1220 coin battery with a battery number of 1 and a diameter of 12.5 x 2mm. This battery is made by Duracell and is a small, thin profile battery. It is perfect for devices which require a reliable, long-lasting power source, such as watches, small electronic devices, and other electronic toys. With its small size and thin design, it can fit into tight spaces where batteries with bigger sizes won’t.