Understanding Car Battery Date Codes

There are a lot of things to think about when you buy a car battery. You want one that is durable and powerful, but also affordable.

One thing many people forget to consider is the date code on the battery. This can give you an idea of how old it is and whether or not it was made in a time period where quality control wasn't very high.

In this article, we will explore what these codes mean and why they are important to understand before you purchase a car battery for your dream car. We will go over everything needed to know about reading car battery date codes.

Battery Date Code Chart










D = Day of Month (02 = 2nd)





M = Month (A-L > E = May)





MM = Month (07 = July)



Back Side


MMM = Month (Oct = October)





Y = Year (14 = 2014)





P = Production Line





S = Shift



Back Side


F = Factory








Back Side



What are these Battery Date Codes?

Car batteries are a major consideration when purchasing a vehicle. There are many different types of battery options for cars, and some have date codes that show how old the battery is.

Car batteries are made with specific battery date code guide that indicate the month and year of manufacture which will allow you to determine its shelf life.

Car battery date code guide can be confusing. You might think that the "D" in the code means that it is a December 2018 battery, but this is not always the case.

Knowing how to read battery date codes can be very useful when selecting a new battery for your vehicle.

If you are unsure about when your battery was made and need to know how long it has been in service, you can read the date code on the side of your battery for information.

Do you think knowing the battery age is something that has any value at all?

The world has changed a lot in the last few decades. We used to rely heavily on fossil fuels, but nowadays we are using electric cars more and more.

In order for these vehicles to function properly, they require constant charging so you must know your battery age before purchasing one of them because if not your car won't charge long enough or will stop working altogether.

Batteries age in a slow, steady process. Unless it is used by the manufacturer to show when they were produced. You'll never need to know that each battery has an expiration date stamped on its side because of how long-lasting and dependable batteries are typically manufactured.

However, if this information does prove useful for something other than simply showing manufacturing dates then knowing your battery's "expiration" may provide some helpful context while planning or determining whether or not it still needs replacing after so many years (usually 5% per month).

The average lifespan of a car battery is 3-5 years. When the battery reaches the end of its life cycle, it will have to be replaced with a new one.

Is there an easy way to check and see when the car battery was manufactured?

Yes. Modern batteries are stamped with an expiration date. It's not just a random set of numbers, it actually says when that battery was produced.

The only trouble is figuring out what those numbers mean. Since so many manufacturers use different codes, it can be tricky to figure out what they all mean.

The first number tells you the year of manufacture, while the second number indicates the month. So a battery stamped with "D34" was made in December of 2014. The last two numbers are to be ignored.

Manufacturers often put a date sticker on the battery to show what month and year it was manufactured. You'll see this when you purchase your new battery, with months indicated in advance of their "in service" date.

The manufacturer calculates its warranty expiry from here - so if yours is expired, be sure to stop by Battery Solutions for an upgrade!

Common Battery Brands with Battery Date Code

1.Napa battery date code is a 1-4 digit numeric code with the first digit indicating the year and the next three digits, or letter in one case, denoting the month of manufacture.

*For example, "M53" would be April of 2013

2.Deka battery date code is a 2-digit numeric code with the first digit indicating the year and the second digit indicating the month of manufacture.

*For example "05" in this case would indicate May of 2005 or 25% (the reciprocal) of 5 years from the date of manufacture.

3. Interstate battery date code is a 1-3 digit numeric code with the first digit indicating the year and the next two or three digits denoting the month of manufacture.

*For example, "D35" would be December of 2015

The Interstate Battery company uses three possible date codes, depending on the length of their battery.

A. The five or four-character code is in either SSMDY (January to September) or SSMY (October to December).

The number and letter combinations represent a month followed by two digits for days within that year's calendar. For example, "0613" represents June 13th, 2013.

B. The battery's top is engraved with 5 numbers that signify the month and year of its production. The first two digits are an easy way to tell if a battery is safe for use or expired.

C. Every battery has a five-character sticker in the top left corner of the casing. The first two numbers on this label correspond to what month and year it was manufactured, just like with your car's VIN number.

The stickers that are located beneath every electronic device or toy you own have some strange things about them like how they're hidden from sight until you take apart devices for recycling purposes (and even then!)

4.AC Delco batteries date code is a 1-2 digit numeric code with the first digit indicating the year and the second indicating the month of manufacture.

*For example, "D45" would be December of 2014.

Some Final Reminders

It is always good to check batteries for expiration dates, especially if you have an expensive device that has over a 10-year lifespan warranty. It is a way of keeping track of the battery's expiration so that you are sure that the battery is not already too old, has expired, or needs to be replaced.

There are lots of varieties of batteries today, as well as what they can do. Different brands have different codes, so it is important to know which one applies to your car's battery.

Understanding the date codes and life span of car batteries is important for safety reasons. Knowing how to identify a faulty battery can help you avoid an unfortunate accident or having your vehicle break down on the side of the road in a dangerous location.

Batteries can be very confusing to users due to their complicated codes but this article provided enough information about the battery date codes so users can easily check and know when the batteries were produced.

This will help users know when to replace it and how long the battery will last.

We hope that this guide provided you some helpful information about how to read car battery date, what they mean, and why it is important to know them.

About the author, Phil Borges

Phil Borges is a battery aficionado. He's written extensively about batteries, and he loves nothing more than discussing the latest innovations in the industry. He has a deep understanding of how batteries work, and he's always on the lookout for new ways to improve their performance.