On 1/12/2023 12:43, mstangelo at comcast.net wrote: > AAAA cells are used in 9 volt batteries. And my penlight! I haven't looked in a while, but I bought some in a 2 or 4 pack at the grocery store a couple years ago. I think I've seen them in pocket radios, and toys in the past as well. Not very common. Kurt