I have an Intel only 13" laptop with 1440p screen. It has a 46 wah battery. I put Ubuntu on it and it lasts forever. Checking with powertop, it idles at around 4.5 - 5 watts at 30% brightness (I don’t like my screen to be too bright) and it goes up to 10 - 12 watts when I’m running a browser then dips down again once the browser is loaded up. I don’t know how they do it and ON GNOME (which is known to sip so much power), but they do and I’m liking it.