Seiko Kinetic Capacitor Battery for Seiko Watch Models 5M22, 5M23, 5M42, 5M43, 7M22, 7M23. This 3023 5MZ Seiko Capacitor Battery is the new Lithium-Ion which is better than the older 3023 5MZ capacitors. Comes with the battery clamps for installation on the movement. Unlike regular batteries this battery doesn't expire. You can find your caliber number by looking at the back of your watch. As always are batteries are fresh and new. Thousands have been sold to customers worldwide. Purchase with confidence.