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AA vs AAA
AA and AAA are not interchangeable. They differ in diameter (14.5 mm vs 10.5 mm), length (50.5 mm vs 44.5 mm). The AA holds about 2.3× the energy of the AAA (2,700 mAh vs 1,150 mAh).
| AA | AAA | |
|---|---|---|
| Type | alkaline cylindrical battery | alkaline cylindrical battery |
| Voltage | 1.5 V | 1.5 V |
| Size | 14.5 mm × 50.5 mm | 10.5 mm × 44.5 mm |
| Typical capacity | ≈ 2,700 mAh | ≈ 1,150 mAh |
| Rechargeable | no | no |
| Other codes | LR6, MN1500, 15A, E91 | LR03, MN2400, 24A, E92 |
Can I use AAA instead of AA?
No. Different width: 10.5 mm vs 14.5 mm.
Can I use AA instead of AAA?
No. Different width: 14.5 mm vs 10.5 mm.
Where each one is used
AA: TV and streaming remotes; Xbox and other wireless game controllers; carbon monoxide detectors and some smoke alarms; wireless mice and keyboards.
AAA: Roku and most TV remotes; small flashlights and headlamps; digital thermometers and blood-pressure monitors; wireless mice.
Both sizes turn up in Roku remotes, Xfinity remotes, depending on the model, which is why people mix them up: check the code on the old cell.