what is the relationship between amp hour capacity and physical size?

Answer 1

There are many kinds of batteries. Amp Hour is a measure of performance. Within a particular kind of battery, the actual size may be identical. That is because they have to fit into an appliance or device and so they are standardized to a certain size. Inside, they can be different. I have AAA batteries that are rated 900 AHr and others that are rated at 2400 AHr. They are all AAA in size.

I suppose that inside, the larger capacity batteries are larger in the size of some component that you can not see from just looking.

Car batteries come in many different sizes. Within a size, there are many different AHr ratings.

;-D I was really disappointed in my digital camera until I got higher capacity batteries. Now I think it is great!