Aging Hipster Dragon Dad
I'm guessing 3DS is probably closer to 3-4 based on that.
Status Update: Played some 3DS on my lunch break. Actually a little better than my original guess. I'm running 2x resolution and still getting 4-5 hours roughly. I'm assuming the general purpose Android OS is taking a bigger chunk of the power vs more gaming centric OSes like Switch'es or Steamdeck's, so the power consumption difference between lower and higher end gaming is less vast.