Wild guess - the disconnect here is that you're interpreting the maximum power rating of your laptop's power supply as an indication of what it typically draws.

Wild guess - the disconnect here is that you're interpreting the maximum power rating of your laptop's power supply as an indication of what it typically draws. It's more an indication of what your laptop would draw if it were doing GPU-accelerated deep neural net training while recharging a completely drained battery, plus a healthy margin of error just to be on the safe side.