In a test case, Google found that after loading 36 random background tabs and a blank foreground tab, battery life increased by 28%. But in a more realistic scenario where there are 36 random background tabs and a foreground tab playing, let’s say, a YouTube video — the battery life still managed to increase by 13% (36 minutes).
Safari browser already uses a 1-minute polling interval, but keeping such a short interval can sometimes cause web app issues. Therefore, Google is considering the same for 5 minutes of inactivity.
This new Chrome feature is only available as a flag in Chrome 86 preview builds, but it would be available for all mobile and desktop versions (Windows, Mac, Linux, Android, and Chrome OS) if at all it is released.