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

Your standard 9v battery is 6 little batteries inside it. Maybe AAAA sized? So yeah it totally could be done if it had been done early enough in battery history. Too late now tho for the reasons others have mentioned.