https://www.cnet.com/news/googles-wear-os-watches-battery-life-improvements-io-2018/

Odds are, the next big wave of Google smartwatches are coming later this year. In the meantime, Google's updating Wear OS (formerly Android Wear) with a few key upgrades. In addition to a better on-board Google Assistant, Google's added battery-saving functions to the new developer build of Wear OS, the company announced Wednesday.

The key parts of that involve re-enabling Wi-Fi when Bluetooth is disconnected, something Google automatically deactivated previously. Google's also recommending that apps don't use background app functions if at all possible, making foreground function the main way apps work, and keeping apps from chewing up processor and battery life.