I bought a used one, the battery life is quite sorry. It can live for maybe 2h using their linux with powertop improvements. Maybe linux is part of the problem and windows would perform better (heard an argument that linux driver writers are not privy to the hw details and so cannot write energy-efficient drivers).

I hate to say it as a linux fan, but if battery life was any important I would buy a mac. I have mac pro 2017 which is probably of the same age, if not older, and the battery life is just so much better.