Google is planning to add a new Chrome feature that could lead to drops of almost 30% in battery usage by throttling JavaScript timers in background tabs. The feature is planned to roll out and will be enabled by default to users of the Stable branch with the release of Google Chrome 86. Google’s experiments found that throttling Javascript timers aggressively leads to almost 2 hours more battery life for a user with 36 tabs and about:blank in the foreground and roughly 36 minutes (13%) more with a YouTube video playing in full-screen.
Source: https://www.bleepingcomputer.com/news/google/new-google-chrome-feature-to-drastically-reduce-battery-usage/