9 Secrets Costco Don't Want You Know

7. Duracell

Duracell is a brand that is highly trusted by the country for all its energizer needs. And you can see Duracell in Costco with Kirkland Signature's brand. Yes! Duracell is the producer of Kirkland Signature brand batteries. Besides, the alkaline batteries in Costco are also made by this brand, said Craig Jelinek, Costco CEO.