Not sure what you're trying to say but

Van gogh's tdp range is 4-15W

Z1e's tdp is 9-30W

Since these are amd's marketing tdp numbers, the actual limit would be 35% higher at 20W for van gogh and 40W for Z1e. Both handhelds have 40000Wh batteries and steam deck already dips below 1.5 hours with some games.

Sure, if people continue to play their games at 800x1280x60 on the rog ally it will last longer but if they try utilizing the better screen and faster apu it will have much worse battery life.