Avast should seriously consider adding an option, to do file scans only when plugged in to power supply.
I don't mind avast crunching through eating up extra CPU, but when unplugged, it's draining my battery like crazy. When avast file scan is active, although it does not eat 100-400% of cpu like others report (only aroung 30-50%), but my battery gets drained with in 2-3 hours, when avast file scan is off, i can get solid 6-8 hours out of my battery.