# What is the difference between AA and AAA batteries?

sivaswetha
What is the difference between AA and AAA batteries? Will the output voltage of 3 AAA and 4AA be same?

## Answers and Replies

Staff Emeritus
Yes. They have the same voltage, but AA batteries store more energy than AAA.

sivaswetha
Ok.thank you

Homework Helper
Gold Member
What is the difference between AA and AAA batteries?

Physical size and energy storage capacity. The voltage on light loads will be the same = 1.5V for alkaline cells.

Will the output voltage of 3 AAA and 4AA be same?

No. The voltage of 3AAA will be around 4.5V and 4AA will be around 6V.

Gold Member
and 4AA will be around 6V.

as will 4 AAA 's

Karmaslap
Jumping onto his thread for a question I had, will AA batteries output more current than AAA will?

Mentor
No. The voltage of 3AAA will be around 4.5V and 4AA will be around 6V.
Caveat being that the OP didn't specify series or parallel wiring, so we can't be sure which is the right answer.

Mentor
Jumping onto his thread for a question I had, will AA batteries output more current than AAA will?
More total energy for sure, more current probably -- that's a function of internal resistance of the battery, which should be lower for the AA.

Karmaslap
Gold Member
Depends on the battery technology, so let's talk alkaline.

The difference between AA and AAA alkaline batteries is the physical size and the capacity, generally measured in milliamp-hours.
The range varies depending on the manufacturer and the battery line.
AA (50ma draw) 1800–2600 mAh
https://en.wikipedia.org/wiki/AA_battery
http://data.energizer.com/PDFs/E91.pdf
AAA (50ma draw) 860–1,200 mAh
https://en.wikipedia.org/wiki/AAA_battery
http://data.energizer.com/PDFs/E92.pdf

The max current capability will be more for a AA given the same battery family (technology and "style")

Last edited:
Karmaslap