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Title: Battery double-talk
Review: Lithium batteries excel with the lowest rate of internal leakage of any type of battery. This means that they will retain at least 80% of their charge during STORAGE for more than ten years. However, when used to OPERATE a device such as a smoke detector, a single lithium battery will slightly outlast two of the same size alkaline batteries. Claims for greater than 2X lithium versus alkaline battery endurance are based on non-typical use in extreme temperatures, and/or unrealistic comparison with obsolete zinc-carbon battery technology.Nonetheless, certain expensive "10 yr" smoke detectors embody a special, NON-REPLACEABLE, large capacity lithium battery which has given seven years' service so far, in my experience.
