Testing executed by Apple in August 2024 working with preproduction Apple Watch Ultra 2 (GPS + Mobile) paired using an apple iphone; all devices analyzed with prerelease software package. Battery life differs by use, configuration, mobile network, signal energy, and all kinds of other elements; real results will vary. n https://www.jowissa.com/de-na/products/plain-mat-leather-watch-strap-e3-1478-m