I've just purchased a Watch4 (not classic) to and am also so disappointed in the battery. I am managing to scrape 24 hours out of it by turning off everything... WiFi, location, using flight mode whenever possible, health settings all to manual and barely using it for anything! If I use any functions... Timer, exercise training... It hammers the battery and I'm having to charge it twice a day. I love the watch and the Samsung fitness interface, but this is disappointing.