It's not windows, so Why do you need AV to run in background in linux ? There is no autorun virus exists in linux which execute download file automatically without user interaction like they do in Windows. AV should run only on demand.
BTW there should hv an option for exclusion but I have not use it so cannot tell as MIUI does this for me
Moreever i disable all apps access for camera but still its eating battery....bro i dont want to loose my data do you think factory reset will help it?