Can you run a 4k laptop in regular HD mode to save battery?
From what I understand, the Yoga 920:
15 hours battery with the FHD (1920x1080),
10 hours battery with the UHD (3840x2160)
I'd prefer longer battery life so I'd like the lower-resolution model. However, if I could get the better screen and run it at 1920x1080 to save battery, I'd consider that.