Discover the reliability of Energizer Max 9V Alkaline Batteries, designed to provide exceptional performance for all your power needs. Featuring advanced zinc-manganese dioxide (Zn/MnO2) chemistry, these batteries are free from added mercury or cadmium, making them a safe choice for your devices. With an impressive shelf life of up to 5 years, you can trust these batteries to be ready whenever you need them. Ideal for smoke alarms, carbon monoxide detectors, and a variety of other moderate current drain devices, this convenient pack of 2 ensures you always have a spare on hand. Choose Energizer Max for dependable power that lasts.