I used to own the XPS 9550 (15", 1080p non-touch) and the battery life was around 6-7 hours with the Nvidia GPU disabled. I bought it used so it might have been

I used to own the XPS 9550 (15", 1080p non-touch) and the battery life was around 6-7 hours with the Nvidia GPU disabled. I bought it used so it might have been even better new too.