Searching Google for Duracell Coppertop leakage, there's quite a bit of evidence that others also think Duracell has gone bad, regarding leakage. Most of this is on the Duracell web site (unhappy campers):
>I've learned to loathe and avoid Duracell Copper tops. They start leaking very quickly
>Very Disappointed in these Duracell AA batteries. You cannot leave them in any item for a extended period or you will find them leaking and contaminating the inside of your electronics
>I've noticed a sudden change in Duracell quality. I have used Duracells exclusively for decades. Many of the Duracell batteries I've changed this year have shown signs of leaking.
>These batteries will leak when the device is turned off or inactive - guaranteed. I have three ruined phones, a ruined keyboard, and a ruined expensive clock to prove it.
>I purchased all my Duracell batteries at Costco. Most of them are dated good till 2018-2023. in the last 2 years I have had the batteries leak and damaged about dozen devises, including radios, flashlights, and toys
In fact, there is even this class action suit:
Duracell Batteries Leak In Normal Use, Class Action Claims
I see no reason to ever buy another Duracell.
>I've learned to loathe and avoid Duracell Copper tops. They start leaking very quickly
>Very Disappointed in these Duracell AA batteries. You cannot leave them in any item for a extended period or you will find them leaking and contaminating the inside of your electronics
>I've noticed a sudden change in Duracell quality. I have used Duracells exclusively for decades. Many of the Duracell batteries I've changed this year have shown signs of leaking.
>These batteries will leak when the device is turned off or inactive - guaranteed. I have three ruined phones, a ruined keyboard, and a ruined expensive clock to prove it.
>I purchased all my Duracell batteries at Costco. Most of them are dated good till 2018-2023. in the last 2 years I have had the batteries leak and damaged about dozen devises, including radios, flashlights, and toys
In fact, there is even this class action suit:
Duracell Batteries Leak In Normal Use, Class Action Claims
I see no reason to ever buy another Duracell.