11 PRO & ios 14.4 (says phone is updated) Everything was fine until the last few days. Now...it seems like the battery will be fine for several hours and then drop from 40% to 20% in a few minutes. When I get the low battery notification at 20%, I will receive another low battery notification in only a few minutes that the battery is down to 10%. Then I can watch it decrease to 1%, which takes less than 10 minutes. phone hasn't yet shutdown due to overheating, but it's getting hot while I'm at home in the AC, looking at photos, twitter, or snap... Checked battery performance today - says I need a new battery - max capacity at 81% --- BUT this time last week, although I hadn't checked my battery performance, I wasn't having any of these problems. I don't know when the 14.4 update occurred, but if it was earlier than last week, I initially wasn't having problems. I've turned off location services, turned on dark mode, turned off notifications for apps I don't care about, etc.