Duracell special application batteries offer reliable, long-lasting power you've come to expect from Duracell. Duracell with DuraLock Power Preserve™ Technology. Guaranteed for 3 years in storage. Alkaline. Mercury free. IEC: 76A 1.5 Volt 105 mAh. designed for use in: Watches, toys, medical devices, calculators, key fobs, cameras and more.