Apple Watch Ultra 4 stretches battery life far beyond the Series 12, but the extra endurance comes with a $400 jump in starting price. The two watches otherwise share Apple’s S11 chip and the same new optical and electrical heart-sensor system.
The $799 Ultra 4 is built for longer stretches away from a charger, with dual-frequency GPS, satellite connectivity, tougher hardware, and extended workout tracking. The $399 Series 12 keeps the same core health platform at a much lower price.
Apple announced both watches on Sept. 9, with retail availability beginning Sept. 18. For most buyers, the choice hinges on whether those outdoor-focused upgrades…
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