Lithium Batteries for Smoke Detectors

Smoke detectors are the clearest case for a long-life primary cell. A detector is mounted on a ceiling and expected to work for years, and the cost of a dead battery is measured in safety, not inconvenience. Primary lithium cells with a shelf life of up to 10 years at category level — LiMnO2 for compact detectors, LiSOCl2 for long-life installations — match the service life that detector makers design for. The search term for this use is large, but this page treats it as an application guide, not as a product claim: the right cell depends on the detector's voltage, current draw and housing.

Most household detectors use small cells, and the selection questions are simple: what voltage does the detector require, what size fits the compartment, and how long must the cell last between changes. For detectors that report wirelessly to a panel, pulse current during transmission also matters, and a hybrid pulse capacitor pack may be worth considering. For a basic standalone detector, a single CR or ER cell with a long shelf life is usually the right answer.

Before ordering, confirm the model, the voltage, the size, the required service life and the final datasheet. Minimum order value is USD $500, according to the company FAQ, and samples are available. Lead time is confirmed per order. Certificates are available upon request.

Related pages: LiMnO2 Batteries, CR123A, LiSOCl2 Batteries, Long-Life Lithium Batteries.