Numerous Apple Watch users have been complaining about a drastically shorter battery life since the update to watchOS 10.1. In some cases, the smartwatch's battery is drained after just a few hours and new problems with charging have arisen. Apple is attempting to remedy this with an update.https://www.notebookcheck.net/Apple-Watch-users-complain-about-extremely-short-battery-life-update-supposed-to-bring-improvement.765699.0.html
I don't remember Apple watches ever having great battery life over some other brands. They do more sure, but that's going to drain that tiny battery faster.