In terms of rechargeable batteries, shelf life refers to how long the battery can sit before needing a charge or expiring. "Shelf life" refers to how long batteries will hold their charge without use, specifically for non-rechargeable chemistries. Most times it will be easily visible and often is highlighted and separated from other text by a colored boxed area or some other distinguishing feature. Most batteries will have the date printed on each individual battery near the chemical composition or battery type information. In the case of button cell batteries, many of them will have it on their box or plastic packaging, but will almost never actually be on the battery itself. The location of the expiration date varies depending on the type of battery and the packaging that is used. Where do I find my battery's expiration date? For a more in-depth look at the differences in self discharge rates visit our guide to battery chemistry or read table 2A below. The rate of discharge varies between battery type and brand and can even be affected by the temperature at which the batteries are stored. Many people assume that batteries remain fully charged until they are used, but in reality, batteries begin losing charge directly after they are manufactured. More specifically battery expiration dates are based upon when the battery's total self-discharge will exceed 20%.Ī batteries self-discharge rate is the speed at which a battery loses charge while sitting idle. When a battery is expired, it means that the battery's manufacturer can no longer guarantee that the battery has a full life or charge. The meaning of expired for batteries is different from the expired used when talking about food products.
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