The Battery Management - app power monitor, im my Samsung Galaxy S7 told me, that neither of them used more than 0.05% battery capacity per hour (plenty of them simply showing 0%). While I presume, that if your scan takes up to a minute to execute (typical for me, if I even bother to wait and look at how slow the progress meter is running), it is not performing idle cycles out of all the "fun", to rob me of my time, but that it is actually actively using the CPU and storage/memory, for the whole duration of the scan, thus burning lots of battery in the process.