I am whittling away at a box of 48 AA alkalines plus some AAAs from Costco, their Kirkland brand.

I have seen a few corroded batteries recently but I think it is primarily because I was feeling paranoid and checked everything I have installed.

I have a distant memory of an alkaline battery test in Consumer Reports a long time ago. If memory serves they noted three tiny dimples in the bottom of the Kirkland batteries that matched the Duracell batteries. Suggestive, but neither manufacturer would confirm or deny, if I recall correctly.

My current Kirkland AAs have two tiny dimples, but I do not have any Duracells to which to compare.