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The Apple Watch Ultra 3 and AAA Battery are most easily told apart by their overall size. On height, the Apple Watch Ultra 3 measures 49.0 mm against the AAA Battery's 44.5 mm — about 4.5 mm more. On width, the Apple Watch Ultra 3 measures 44.0 mm against the AAA Battery's 10.5 mm — about 33.5 mm more. On thickness, the Apple Watch Ultra 3 measures 14.4 mm against the AAA Battery's 10.5 mm — about 3.9 mm more.
The Apple Watch Ultra 3 is the heavier of the two at 61.4 g, compared with 11 g for the AAA Battery. That is a 50.4 g difference (458%). In daily handling the difference is easy to feel.
| Metric | Apple Watch Ultra 3 | AAA Battery | Diff |
|---|---|---|---|
| Width | 44.0 mm | 10.5 mm | +33.5 mm |
| Height | 49.0 mm | 44.5 mm | +4.5 mm |
| Depth | 14.4 mm | 10.5 mm | +3.9 mm |
| Weight | 61.4 g | 11 g | +50.4 mm |