You mean ... gasp ... they might be fakes.

The EU has a quality mark "CE" - Conformitè Europëenne. Sometime the font is a bit wonky and it is alleged that CE in that case stands for China Export instead. I imagine that https://en.wikipedia.org/wiki/CE_marking#%22China_Export%22 is policed quite carefully.

those are just self-certified, CE is only on the authority of the people who put the label on not on some EU agency. They can be held accountable for not following CE correctly but not having the correct logo is not a problem.

I get Duracell Industrials through my works office supplier, they also leak frequently.

Back when I still bought them, I'd get them from the local big-chain supermarket. So I'm pretty sure they weren't fakes.

ya saying..."Totally 100% Genuine" Duracell could leak less...