Batteries have a shelf life and will eventually die even if they're not used. To check the date on a battery, you need to know what the characters on the battery mean. The first character will be a number from zero th. “””The first number is the month and the letter is the year. For example, if the code is 3L, the battery was made in. This is a question that we get a lot, so we figured we'd answer it here in our blog. To check the date on your Exide battery, all you need to do is find the small white sticker on the top of the battery. This sticker will have a bunc. The date on top of a battery corresponds to the year and month of manufacture. The number corresponds to the year and the letter corresponds to the month. So, if you see an 8D on your battery, it means that it was manufacture. The battery date code chart is a tool that allows you to determine the date of manufacture for a given battery. The date code is typically stamped on the battery itself, and can be used to determine the age of the battery. To check a car battery's serial number, you will need to locate the battery on the car. Once you have found the battery, look for a sticker or label on the battery that will have the serial number printed on it.