Don’t let their small size fool you: This Energizer 1620 Lithium Coin 3-Volt Battery delivers big time on long-lasting, dependable power for your coin-battery-operated items. From heart rate or glucose monitors to remotes, keyless entry systems, key fobs, watches, toys, and games—and even more specialized devices—our coin batteries are compatible with the devices that fit your life, so you can keep going.