Costco Car Battery Review

Interstate car batteries have replaced the beloved Kirkland brand at your local Costco. Warranties of older Kirkland car batteries will still be honored and those stepping up to the plate to purchase an Interstate car battery will be pleasantly surprised to know the free replacement warranty period was extended from 36 months to 42 months.
An Interstate car battery will cost on average of 77.10 dollars, plus an additional 15 dollar core fee which is refundable upon the return of your old battery. It has been 2 years since Costco has rolled out the Interstate car battery at Costco and prices have remained relatively unchanged (in the Southern California area).
Interstate car battery are replaced for free for any failure within 42 months. This is a bit different than the Kirkland car battery warranty which provides coverage up to 100 months – a period of time that extends far past the expected life of the battery. Any failure within 3 years will entitle you to a full refund of the purchase price; after this period, you will be entitled to only a certain percentage of the purchase price as time progresses.
Based upon 78 data points provided by ConsumerPete readers, a Kirkland car battery on average will last 4 years and 8 months. Longer lasting Kirkland car batteries will provide 6 years of service and shorter lifespan batteries have been noted to provide only 2 years of starting power.
Early data is trickling in on the performance of Costco's Interstate car batteries. Some users have needed to exchange their battery at the 24 months and failures in colder climates have been noted at 12 months. As more data becomes available, we will have a better idea on how exactly the Interstate branded batteries will last.
Costco Interstate Battery Prices
Car battery failures are replaced for free within 42 months of the purchase date. Marine/RV and golf batteries are covered for 12 months.
If your Kirkland car battery recently died, note the lifespan of it at the bottom of this review so that we can continue providing useful data to ConsumerPete visitors.
Previous Review: 100 Month Warranty for 12 Month Battery

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Latest Costco Car Battery Review
Have a Kirkland Signature battery in my 2004 Chevy Cavalier with 133k miles. Sticker shows the battery made 7/11 and I bought it August 2011. Almost 6 years later, it's mostly working but starting to wane.
Ohioan on 4/25/17
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Beware that Costco does not merely replace the battery if it fails within the warranty period. You may end up being credited the price you originally paid, but then have to eat the difference if the price has increased since your original purchase. If you google it, you will discover this is an ongoing problem. Costco is now selling "Interstate" brand batteries, not Kirkland brand. We had very good luck with the Kirkland brand (it's over 6 yrs old and working great), but am concerned that current models may not be as durable.