t's not great
2h20 of autonomy (in idle, without kidney of started) on a new battery... that cut my toes! But that's still enough with my old original battery (1H30) and the on-board backup battery (1H) on the lenovo X250 for the urgent use I have, so I'm not returning it. But I am very fair, I would have liked at least 3H. (Use: (Nomadic use of Stellarium under Liunux).