Testing Done by Apple in August 2024 using preproduction Apple Watch Ultra 2 (GPS + Cellular) paired by having an apple iphone; all gadgets tested with prerelease program. Battery daily life may differ by use, configuration, mobile network, sign power, and all kinds of other things; actual benefits will fluctuate. https://www.jowissa.com/de-na/products/facet-princess-swiss-ladies-watch-j8-063-m