If you want to also be pedantically technically correct, 9V batteries are often made from 6 AAAA cells. Most of the things people call battery are actually cells, the common batteries are 9V (6x1.5V cells) and 6V (4x1.5V cells) alkalines, 12V lead-acid (6x2V cells) and electric vehicle batteries (lots of 3-ish volt cells of various lithium technologies)
9v batteries are actually 6x AAAA batteries in a little case.
I also saw some small rectangles batteries stacked
If you want to also be pedantically technically correct, 9V batteries are often made from 6 AAAA cells. Most of the things people call battery are actually cells, the common batteries are 9V (6x1.5V cells) and 6V (4x1.5V cells) alkalines, 12V lead-acid (6x2V cells) and electric vehicle batteries (lots of 3-ish volt cells of various lithium technologies)