Lithium Button Cell Battery CR1620, 3 V DC, 81 mAh, 1-Blister

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 - the coin battery is compatible with the devices that fit your life, so you can keep going.