Procell Alkaline Constant 9V industrial batteries are ideal for powering low-drain professional devices which require constant current over long periods of time such as smoke/carbon monoxide detectors, remote controls, flashlights, and more. Guaranteed 5 years in storage. Delivers longer lasting power (vs. prior Procell Alkaline 9V batteries) in low drain professional devices that may result in fewer battery replacements and can lead to savings on operating costs associated with battery replacement. Operating temperatures from -4°F to 129.2°F. You can use up to 30% fewer batteries by switching to Procell Constant for low-drain devices (estimated savings versus relevant competition). Manufactured using superior cell design (vs. prior Procell Alkaline 9V batteries) to ensure high-quality cell construction. Economically packaged in bulk. Available in AA, AAA, 9V, C, and D sizes.