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The AA Battery and AAA Battery are most easily told apart by their overall size. On height, the AA Battery measures 50.5 mm against the AAA Battery's 44.5 mm — about 6.0 mm more. On width, the AA Battery measures 14.5 mm against the AAA Battery's 10.5 mm — about 4.0 mm more. On thickness, the AA Battery measures 14.5 mm against the AAA Battery's 10.5 mm — about 4.0 mm more.
The AA Battery is the heavier of the two at 23 g, compared with 11 g for the AAA Battery. That is a 12 g difference (109%). The weight gap is modest and rarely the headline difference between them.
| Metric | AA Battery | AAA Battery | Diff |
|---|---|---|---|
| Width | 14.5 mm | 10.5 mm | +4.0 mm |
| Height | 50.5 mm | 44.5 mm | +6.0 mm |
| Depth | 14.5 mm | 10.5 mm | +4.0 mm |
| Weight | 23 g | 11 g | +12.0 mm |