If the battery pack is rechargeable, for instance, a two-way radio battery or a sealed lead acid battery, shelf life takes on a little bit of a different meaning. How long they will hold a charge while on the shelf refers to “shelf life”. You put the unused ones on the “shelf” for later use. Unless the manufacturer states it in the device manual, and since we don’t know how much energy each device draws from the battery, not to mention that fact that sometimes devices draw more energy as they get older, it’s very difficult, if not impossible, to answer this question in general.Īs an example of shelf life, you may buy a pack of 9V batteries, but you don’t use them all. Each device draws down a different amount of energy (watt-hours). AA’s can be used in flashlights, digital cameras, etc. The answer to that question is dependent in which device the battery is used. First let’s clarify the meaning of each measure of lifespan.Ĭommonly confused with cycle life and shelf life, run time refers to how long a battery or battery pack will run on a single use. For the answer to this common but complicated question, we must break down the answer for each chemistry. Batteries have three distinct measures of life (run-time, shelf life and cycle life), and each type of battery chemistry has a different answer (alkaline, lithium-Polymer, etc.). The real question is, though, not how long batteries last, but how long SHOULD batteries last. “How long will my battery last?” I get this question a lot.
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