According to NetEase science and technology news, Apple yesterday pushed the watchOS 3.1 beta3 beta for registered developers. Testers said that this update seems to improve battery life. The development code for watchOS 3.1 beta 3 is build 14S471, which can be updated by connecting Apple's iPhone Watch.
Unlike iOS and mac OS, there is no public beta version of watch OS. Only Apple registered developers can install and test the watchOS beta version. The previous version of the watch OS 3.1 beta did not specify any feature updates. However, some commentators indicated on Reddit that they have seen an improvement in battery life after the installation of the update.
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