I have an iPhone 11 Pro Max with this issue. I believe I have narrowed it down to an issue with Podcasts. Go to Settings => Battery and then scroll down to Battery usage by app. At least for me, there is an insane amount of drain from Podcasts. I see they really revamped the Podcast app as well. AND, the phone gets really hot when I listen to podcasts which I do every night. If there are some Apple folks reading this, I didn't change any of my podcast settings at all and this started right after updating to iOS 14.2. Previously, using the Podcast app hardly drained the battery at all & the phone never heated up. We need a fix soon, please! PS I am going to try adjusting from factory settings for the Podcast app. I am testing not downloading any podcasts (a terrible long term solution!) as well as turning off sync podcasts. Not sure yet if this will help. - I just adding COVID contact tracing today. So that is definitely not my issue.