if you have Samsung mac installed then switch membership from premium to free.https://techpp.com/2019/09/07/block-full-screen-ads-on-android/amp/#aoh=15854054005614&referrer=https%3A%2F%2Fwww.google.com&amp_tf=From%20%251%24s

check for apps draining battery in background also try switching off auto sync.

rest is used by system files