Linus Sebastian, known online as Linus Tech Tips, put all four major browsers Edge, Chrome, Firefox, Opera through an independent test to assess their true capabilities. His test involved buying four identical Dell Inspiron laptops, disabling all their bloatware and leaving the laptops running overnight, browsing the web via automated scripts. His results showed that Chrome, and not Edge, takes the smallest toll on laptop batteries, and it does so on a more consistent basis, unlike Edge, who’s battery life drainage varied wildly.
Source: https://www.bleepingcomputer.com/news/technology/chrome-beats-edge-in-independent-battery-life-test-despite-microsofts-claims/