My x270 could pull about 20 hours on Linux when it was new (it did degrade a bit over time, as batteries do). I don't recall if I fiddled with any settings as t

My x270 could pull about 20 hours on Linux when it was new (it did degrade a bit over time, as batteries do). I don't recall if I fiddled with any settings as this was five years ago and the laptop since died in an accident, but I don't think I did other than setting it to "power saving" instead of "balanced". Before that I had a Dell XPS, which lasted about 7 hours IIRC, which was pretty good for the time. My Acer could pull about 15 hours when new, but it is a fairly underwhelming Celeron CPU so that probably helps. Maybe other systems are worse; I don't know, but overall things always seem to work well for me.