# What is the difference between AA and AAA batteries?

1. Jan 18, 2016

### sivaswetha

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

2. Jan 18, 2016

### Staff: Mentor

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

3. Jan 18, 2016

### sivaswetha

Ok.thank you

4. Jan 18, 2016

### CWatters

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

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

5. Jan 18, 2016

### davenn

as will 4 AAA 's

6. Jan 18, 2016

### Karmaslap

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

7. Jan 18, 2016

### Staff: Mentor

Caveat being that the OP didn't specify series or parallel wiring, so we can't be sure which is the right answer.

8. Jan 18, 2016

### Staff: Mentor

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.

9. Jan 18, 2016

### meBigGuy

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: Jan 19, 2016