Comment by yjftsjthsd-h

It's really not. Leaving aside Android because that has a very different userspace, Chromebooks have excellent battery life even when not running ChromeOS, because they have proper drivers and someone actually bothered optimizing for power efficiency. And there are plenty of cases of people switching a machine from Windows to some Linux distro and significantly improving battery life (see elsewhere in this comment section). So no, if a given laptop is described as the vendor as "Linux first" and has poor battery life, that's on them.