Add power usage of battery in idle in the page of TLP
using powertop without charging and apps closed and only the desktop running can gives you the power usage idle. It is a good way to compare the power usage between systems or hardware. for example, my system( asus fx505dy 3550H + rx 560) has a power usage of 12 W in linux and in windows 5 W, speaking in idle
Edited by Alberto Gómez Marín