I think Duracell co-brands for Costco.
Johnson Controls
Johnson Controls
Johnson Controls
Costco Kirkland batteries are made by Johnson Controls which is a leading battery manufacture in the U.S.
Costco Kirkland batteries are made by Johnson Controls which is a leading battery manufacture in the U.S.
The Kirkland Food company
Diamond Pet Foods makes Kirkland for Costco. Diamond Pet Foods makes Kirkland for Costco.
The majority of car batteries are created by 3 manufacturers - Delphi, Exide and Johnson Controls Industries. Delphi makes some EverStart models sold in Walmart and ACDelco. Johnson Control Industries makes Duralast seen in Autozone stores, Diehard - sold in Sears, Kirkland - the Costco brand, Motorcraft - which Ford sells, some of the EverStarts, and Interstate. Exide makes Exide batteries, Champion, Napa and even a % of the EverStart batteries.
Some of the best brands of car batteries according to users are DieHard from Sears, NAPA batteries, EverStart batteries found at Wal-Mart, and Costco's Kirkland batteries.
Honda
Kirkland
Johnson Controls. They also make car batteries for Toyota (True Start), Mazda, Mitsubishi, Honda and Acura dealers, Costco (Kirkland signature), AutoZone (Duralast), Advance auto parts (Autocraft), and Les Schwab. They make the best car batteries in my opinion. They used to make the Wal-Mart Everstart batteries, but now those are made by Exide.