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

You mean like a CR2 and the CR123A battery ?

They exist, but the mass production of AA and AAA batteries makes them a lot cheaper, and can be found in almost every shop in the world.

Also, using two AA batteries can be more versatile as they can be be used in serial making 3V or in parallel making double the energy in 1.5V