What is milwaukee battery date code?

Milwaukee battery date codes are a four-digit code printed on the battery that indicates the date of manufacture. The first two digits represent the year of manufacture, while the second two digits indicate the week of the year. For example, a code of "1813" would mean the battery was made in the 18th week of 2013. Milwaukee batteries typically have a lifespan of 3-5 years, depending on usage and storage conditions. It's important to check the date code when purchasing or replacing Milwaukee batteries to ensure they are not expired or close to expiration, which can affect performance and lifespan.