ELI5. Why do most devices requiring AA or AAA batteries need at least two. Why not create a standard battery that is the equivalent of two or have common circuitry that only relies on one battery of a similar low profile?

Question

ELI5. Why do most devices requiring AA or AAA batteries need at least two. Why not create a standard battery that is the equivalent of two or have common circuitry that only relies on one battery of a similar low profile?

In: Engineering

Answer 1

There are already [plenty of standards](https://en.wikipedia.org/wiki/List_of_battery_sizes), with different sizes, voltages, capacities, and form factors. Another standard isn’t needed. But most of those standards aren’t often used. Because it’s easier and better for everyone to just stick to the most commonly available and interchangeable ones.