what’s the difference between AA and AAA and other batteries? Why do we have a bunch of different ones?

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what’s the difference between AA and AAA and other batteries? Why do we have a bunch of different ones?

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They are sizes.

Back in the day, batteries came in size A, B, C, D, etc.

A being the smallest, and because they couldn’t make batteries that were smaller at the time, it was fine.

But, as tech got better we COULD make batteries smaller, so what is smaller than A? AA, then AAA, then AAAA.

Afaik the biggest diffrence is size, and some have a diffrent voltage and capacity.

I assume we need to have diffrent sizes, because for example a wristwatch would have to be really big to run on AA/AAA batteries

This [site](https://www.batterypowerzone.co.za/blog/60/why-are-batteries-called-aa-and-aaa) breaks it down.

AAA batteries are smaller compared to A. The smallest battery is of pin-shaped, 3.5mm diameter lithium-ion.

AAA batteries carry a smaller amount of mixture as compared to the AA.

AAA batteries carry a smaller amount of charge as compared to the AA.

AAA batteries are used in low power (small) devices, while AA batteries are used in high power (small) devices.

Because you need big beefy batteries to operate things like a remote controlled car without it dieing after 5 minutes but you also need tv remotes that fit in your hand.

Your cylindrical alkaline batteries all have the same voltage. AAA, AA, C, D are all 1.5 V. They have the ability to satisfy higher current (draw) the larger they get. If you could adapt a C battery to a device requiring a D cell, it would still run but it might not run for very long. Small devices typically don’t require much current, so the battery can be made smaller, allowing for a reduction in size of the device.

Why are there different ones? Imagine bowling about with 6 AA’s in your wrist watch.

Not all 9V are made from 6 AAAA. I recently ran into a stack of flat Batteries that they built 9V out of. Now I get an X-ray first before I tear them open. It helps to have a friend with an X-ray machine

I’ve been playing too much Halo and read AA Batteries as “Anti-aircraft batteries” and was wondering myself what a AAA battery is 😛

In the days before transistors, there were portable radios that used vacuum tubes. These required two kinds of batteries.
1. A low voltage battery to heat the filaments of the tubes. This was called the A battery.
2. A high voltage battery to supply the plate voltage for the tubes. This was called the B battery.
Later when letters were used for different battery sizes, B was not used for a low voltage battery size, since it was already used for the high voltage plate battery.

Just size of battery. Bigger batteries store more power (given the same chemistry) , though most batteries provide the same voltage (1.5v) and current (except 9 volts and 6 volt batteries).

So the application be and form factor determine the size. Like large flashlights typically use D batteries, but a watch would use a smaller battery