Microsoft didn't just do a battery test, they also release statistics based on Windows 10 telemetry showing that Edge has better battery life than Chrome, Firefox:
"In addition to testing battery life internally, Microsoft also looks at tens of millions of PCs that send telemetry data to the firm, Weber said. And what it sees there is simple: A small advantage over Firefox, but massive gains of about 50 percent additional battery life when compared to Chrome."
"In addition to testing battery life internally, Microsoft also looks at tens of millions of PCs that send telemetry data to the firm, Weber said. And what it sees there is simple: A small advantage over Firefox, but massive gains of about 50 percent additional battery life when compared to Chrome."
https://www.thurrott.com/windows/windows-10/68176/microsoft-...