Tests performed by Apple in August 2024 making use of preproduction Apple Watch Ultra two (GPS + Mobile) paired using an apple iphone; all devices tested with prerelease software package. Battery daily life may differ by use, configuration, cellular network, sign power, and many other elements; actual effects will vary. https://www.jowissa.com/de-na/products/facet-swiss-ladies-watch-j5-556-l