It wasn’t like that in the past (AA were more common). The component that needs the AAA battery isn’t getting smaller either.
In: Technology
I am not sure that AAA is more common than AA today. The difference is certainly smaller today than in the past.
Electrical devices that need a lot of power tend to have rechargeable lithium-ion batteries today.
In the past, they tended to have replaceable batteries that were AA because that is often a reasonable compromise between size and capacity.
Most stuff that uses replaceable batteries today is devices with very low power usage so even AAA batteries can operate them for months like remotes, clocks, thermometers etc.
The electronics in devices like that are more efficient today so they require less power so a smaller battery can do the same as larger in the past
If you use AAA instead of AA you can make the device smaller.
So AA and larger batteries are less common today because of Li-ion batteries and a as result AAA will be a larger percentage of battery usage even if the user has not increased.
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