Duracell Ultra Alkaline 9V Batteries are engineered to deliver maximum power and long-lasting performance, making them ideal for high-drain and essential devices. Trusted by professionals and consumers alike, these batteries are commonly used in smoke detectors, radios, medical equipment, microphones, and test instruments. With Duralock Power Preserve™ Technology, they retain power for up to 5 years in storage, ensuring they’re ready whenever you need them.