I tried feeding my ASUS Zephyrus G15 (GA503QM) 5V over USB-C once. It discharged faster, because it decided “hey, I’m plugged in, I can consume more power”, and even my attempts to reduce it by controlling the CPU’s power limits (which absolutely reduces its consumption when unplugged) didn’t make it discharge more slowly than not being plugged in.
I think I estimated it was getting around 1.5W (by putting it to sleep for hours and comparing the small amount it had filled by with the drain of a similar period unplugged), though the wall adapter is rated for 11.5W (5V/2.3A), and certainly charges a phone at about that.
I think I estimated it was getting around 1.5W (by putting it to sleep for hours and comparing the small amount it had filled by with the drain of a similar period unplugged), though the wall adapter is rated for 11.5W (5V/2.3A), and certainly charges a phone at about that.