Testing Done by Apple in August 2024 utilizing preproduction Apple Watch Extremely 2 (GPS + Mobile) paired with the apple iphone; all devices analyzed with prerelease computer software. Battery lifetime may differ by use, configuration, mobile network, sign strength, and all kinds of other variables; real final results will fluctuate. https://www.jowissa.com/de-na/products/stingray-watch-strap-e3-1113