I'm the fine print at the bottom of the ultra page Apple give the exact circumstances in which they got 36hrs.My take on battery life having had the Ultra since Friday - It’s a vast improvement on my series 7, but not quite as good as expected.
Charged to 100% at 1538 on Friday, died Sunday at 2040 giving a total of 29 hours and 2 mins vs the “expected” 36.
During that time I had 1hr 30mins of GPS usage and just over an hour of constant heart rate monitoring on a static bike workout. It was connected via Bluetooth for the entire time, so the battery wasn’t drained due to cellular usage (which used to batter my series 7). Very minimal app usage but obviously 2 nights of sleep tracking (which I assume to be a fairly low power activity but 🤷🏽♂️).
Based on Apple’s claim of 36 hours including 8 hours of GPS + Cellular, I’d have expected to have got closer to their figure or possibly even over.
Will be interested to see how it levels out over a week or so, as I may have been inadvertently checking it more than usual etc.
- All-day battery life is based on the following use: 180 time checks, 180 notifications, 90 minutes of app use, and a 60-minute workout with music playback from Apple Watch via Bluetooth, over the course of 36 hours; Apple Watch Ultra (GPS + Cellular) usage includes a total of 8 hours of 4G LTE connection and 28 hours of connection to iPhone via Bluetooth over the course of 36 hours. Testing conducted by Apple in August 2022 using pre‑production Apple Watch Ultra (GPS + Cellular) paired with an iPhone; all devices tested with pre‑release software. Battery life varies by use, configuration, mobile network, signal strength and many other factors; actual results will vary.