Nothing is written or printed on the packaging or on the battery. Alkaline battery life is so dependent on how the batteries are used, and there are no standards.īutton Cells – One important piece of information that missing…there is no battery expiration date code. Better batteries will show a later expiration date. The fact that they come precharged was also a plus. We look forward to taking advantage of the fact that they are rechargeable. We like having a 4 pack as we can use for other household items. It is probably a conservative date, so most batteries will have a full life after that time. These Rayovac AAA rechargeable batterries were a good buy. The expiration date is usually the date past which the manufacturer will not guarantee that full life is left. It will probably depend on the manufacturer. Manufacture and expiration dates most likely have little to do with each other. (Rayovac Battery cases are marked with the expiration date – also noting the AA battery life, 9V battery life, etc.) The batteries inside are still fresh – and that’s where you need to look – on the actual battery to determine AA battery life, 9V battery life, as well as all alkaline battery life. If it is left to sit long enough, it will eventually burn itself out.Įnergizer and Duracell battery cases are stamped with the manufacture date, not the expiration date, so do not be concerned if you receive a shipment with the case stamped 6 months or a year on the back. The reaction continues even as the battery sits outside the device. Since the life you’ll get from a battery is dependent on when the battery was made, not necessarily when it was put into service, it’s important to know the date code so you can be sure the battery you buy is “fresh” and hasn’t been sitting on the shelf for a couple of years.īatteries operate on a chemical reaction. Learn about alkaline battery life, AA battery life, 9V battery life and more.
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