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.

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60 months on a Kirkland battery (Group 35, # 12865) Installed 10/12, died 10/17.
Paolo from Ft. Washington, MD on 10/26/17
i bought a Kirkland 51 group battery for my 01 Civic on Oct/2012 and it required a longer cranking time to starting it around October 2017. I have always topped it up with fluid yearly so I was kinda of dissapointed it didnt last as long as my Honda OEM battery for 7 years. I have replaced it with the 42 mos Interstate ....Will see how long this will last.
Liam on 10/22/17
In July 2012 I bought a Kirkland 25-640 (Costco item # 12870, price $65.89 + core & tax) for a 2002 Acura CL (3.2L V6). It lasted over 5 years until this past week (October 2017). I've just replaced it with an Interstate 25-550 (Costco item # 852231, price $71.99 + core & tax). Fingers crossed it'll last as long as the Kirkland battery.
Rob S in TX on 10/17/17
Interstate 850242 purchased from Costco and installed on 3/3/15. Engine wouldn't start on 11/14/17.
RC on 10/15/17
Kirkland Group 35 lasted from September of 2011 until October of 2017. Looks like 73 months of a 100 month prorated warranty for a 2001 Camry. Previously had a Kirkland Group 35 in a 2001 Subaru Forester that lasted approximately 9 years. I'm happy with Costco.
Anita Mintz on 10/14/17
Kirkland battery purchased in October 2013 for my 2006 Subaru Legacy wagon manual transmission lasted 4 years to the day in Sacramento CA. Was supposed to be a 100 month warranty and Costco honored the prorate schedule of 50% back. Purchased one of these new Interstates with the 42 month warranty, hope it wasn't a mistake. Guy at the counter claimed "the old Kirklands were Interstates too, they've just changed the warranty and label"
LP on 10/12/17
I've got a 13 year old Kirkland battery in my 1991 F-150. Still works fine, wish I could buy another.
J Ward on 9/27/17
Kirkland battery in an 08 Mazda 5 lasted 5 trouble free years.
Sean in CA on 9/26/17
83 months on Kirkland 2001 Toyota Camry
Ann in Albuquerque, NM on 8/30/17 on 8/30/17
Hi Ed, I purchased an interstate battery for my suburban in June 4th 2016. Model # 850263 CCA 800 42 Month Warranty Free it read on battery. It is August 21, 2017 and the battery is having a hard time starting on initial start in morning. I hooked a charger up to it for overnight charge at 2 Amp charge and next morning it started fine. The following day it was back to having a hard time starting again. Going back to Costco with it today.
JW on 8/21/17
Featured Comment
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.
By Ed on 8/31/14