The Synergy Lithium Battery CR1616 5pcs is a reliable and compact coin cell battery designed to deliver stable and long-lasting power for small electronic devices. Built with high-quality lithium technology, it ensures consistent voltage output and dependable performance. These batteries are ideal for watches, car key remotes, calculators, fitness trackers, and other precision electronics. With a 5-piece pack, you get extra convenience and value, ensuring you always have backup power when needed.