Ordered 3 batteries for my 3 Maglite battery lights. When they arrived the first thing I checked was the date code. To read the date code, it is listed on the label and begins with a letter; "I". My date codes for these three batteries were 4914 for 2 and 1815 for the 3rd. The first two digits are the week and the last two digits are the year. So two of the three batteries were made on week 49, 2014, and the third battery was made on week 18, 2015. It turns out that this is the first week of December 2014 for two and the second week of May 2014. So two batteries are 13 months, one year and one month old and one battery is less than 8 months old. I called MAG Instrument's corporate office at the number listed on the battery box. I spoke to the warranty department. They didn't have exact information about the expiration date, but they recommended contacting the sales department. I have made. They said and read directly from their documentation that these batteries lose 2 or 3% capacity in the first year on the shelf and 10% in 2 years. I didn't ask for more years, that answered my question. What does that mean; loses 2 or 3% capacity? The battery is said to be 3500 mAh. 3% of it is about 100mAh. Not so much, I thought to myself. However, the seller I spoke to told me not to keep them if I was paying for "fresh" batteries; Batteries less than 6 months. Let me repeat: FACTORY sales say to return batteries older than 6 months. This is based on the manufacturer's date on the battery. I'm sending all three back. I have considered keeping the "freshest" battery more than 8 months old, but there is a policy here, along with the factory recommendation to only accept a battery that is 6 months old or newer.
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