Long-Lasting Performance: Get reliable, long-term power for high-drain devices like smoke detectors, measurement tools, and professional equipment. Each alkaline battery delivers a steady 9 volts, reducing the hassle of frequent replacements Versatile for Everyday Electronics: Ideal for garage door openers, smoke detectors, carbon monoxide alarms, clocks, radios, toys, and flashlights. Our 9 volt batteries are ideal for home, office, camping trips, and emergency kits Up to 10 Years of Shelf Life: Designed with a leak-proof seal, our 9V square batteries avoid internal fluid loss and safeguard your devices. Stores securely for up to 10 years in a cool, dry place