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The Apple Watch Ultra 3 and AA Battery are most easily told apart by their overall size. On height, the AA Battery measures 50.5 mm against the Apple Watch Ultra 3's 49.0 mm — about 1.5 mm more. On width, the Apple Watch Ultra 3 measures 44.0 mm against the AA Battery's 14.5 mm — about 29.5 mm more. They match almost exactly in thickness, at 14.4 mm.
The Apple Watch Ultra 3 is the heavier of the two at 61.4 g, compared with 23 g for the AA Battery. That is a 38.4 g difference (167%). In daily handling the difference is easy to feel.
| Metric | Apple Watch Ultra 3 | AA Battery | Diff |
|---|---|---|---|
| Width | 44.0 mm | 14.5 mm | +29.5 mm |
| Height | 49.0 mm | 50.5 mm | -1.5 mm |
| Depth | 14.4 mm | 14.5 mm | -0.1 mm |
| Weight | 61.4 g | 23 g | +38.4 mm |