Vincent Peri
Member
In the last year or so I had serious leaks with brand new Duracell AA and AAA alkaline batteries bought in Canadian Costco. Never had to deal with so many bad fresh batteries.
It sounds like they were counterfeit batteries. In the 45 years I've been in photography, I never had a single Duracell give problems. I did have batteries that came with a Leica SL2 camera (c. 1975) corrode. Had to send the camera back to Leica for warranty repairs.