Best answer: from the energizer site - To find the Best If Used By (BIUB) date of the batteries in question, please look on the uppermost section of the cells, near the battery type (AA, 9V, etc.). You will see a white box with the Best If Used By year printed within it. You can find smaller cells BIUB on the packaging. The best consumer experience and battery performance occurs with battery usage before the Best If Used By Date. The battery may function beyond that date but with lower performance.
Most claim lithium have A 7 TO 10 YEAR SHELF LIFE.
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