same battery drain issue came right after ios14 update on my iPhone 7. It came to 10%. From 90% over night without using for 1 single minute foreground and 100% battery used by maps on first day then 70% to 0% on second day where battery usage shows weather app consumed 100% over background then I removed all widgets from the home screen but battery draining didn’t stop and this time on 3rd day app consuming my battery on background was Personal hotspot 100% and I haven’t used it today even for a while and this personal hotspot thing still consuming the battery while I am replying to this thread. Wish I could go back to ios13 without compromising my data. Worst update I am facing yet. Please Apple bring some fixes.