For nearly the past 10 years, I've found that the Kirkland brand batteries leak without fail. Doesn't matter what size, they all leak. I can't wait for them to find a new
Duracell CopperTop C Batteries, 14-count | Costco
Kirkland Signature Alkaline AAA Batteries, Pack of 48 | Costco
400198 DURACELL 9V BATTERIES PACK OF 8 5 00 INSTANT SAVINGS EXPIRES ON 2021 12 28 14 99 - Costco East Fan Blog
11 different brands of AA batteries, tested in identical flashlights (Kirkland represents well) : r/Costco