eli5 What makes a AAA battery different from a AA battery other than it being smaller? What’s the actual difference ?


eli5 What makes a AAA battery different from a AA battery other than it being smaller? What’s the actual difference ?

In: Technology

It stores less energy, produces energy at a lower rate, and all this is a consequence of being smaller.

It’s like the difference between a 5 gallon gas can, and a 1 gallon. They store the same thing, which burns the same, one just holds more.

That said, there are different battery chemistries with different characteristics. But those are all available in both sizes.

It’s smaller because it’s got less battery goop in it. It having less battery goop in it makes it give off less power. AAs do 3 volts of power and AAA do 1.5 (ish)

The only difference between an AA and AAA battery is the size – because the AA battery is larger, it holds more of the chemistry that makes a battery work. The more chemistry it contains, the more power it stores and the longer the battery will last in use before it runs out.

A C or D cell battery is also exactly the same as an AA cell, just even bigger, and while pretty rare, you can get things like AAAA batteries that are even smaller versions of a AAA (these are often found making up 9v batteries – 6no 1.5v AAAA batteries wired in series to make one larger 9v battery).

Not all batteries are the same though – if you look at a CR2 or CR123 battery for example, these use different designs and chemistries to produce different voltages suitable for other uses.

they are the same – just smaller and hold less power.

you can put AA battery and something metal liken a spring from your pen and it will work. just for little less time than AAA battery.

same the other way – you can connect AAA to AA slot with 2 wires and it will work longer than AA

AA and AAA are literally the sizes. That it.

The volume and shape is the only difference. To get a DIFFERENT battery you would have to go to a different chemistry. Like lithium, or lead acid. And those have their own sizes.

Lead acid has the “Group size” standard because virtually all consumer facing uses are groups of cells in series to get standard voltages like 12v for a car. Their sizes usually determine runtime and how hard it can burst. (Without getting into differences like deep cycle, marine, sli, etc)

Lithium usually has a dimension system, like 18650 (18mm diameter, 65.0mm long) for vape and flashlights. Or xSxP for pouch type cells (RC cars, etc) which denotes how many cells in series and how many in parallel. Starts getting technical here so I’ll stop until more is requested.

Alkaline cells just use an alphabet system for sizes; “AA” “AAA” “C” and “D” being the most common for the consumer.

BONUS: 9v batteries are just 6 “AAAA” batteries in series inside a can.