Iphone 13 pro 16.1 IOS battery draining

The usual advice:

1. Check Settings -> Battery to see what is reported as using a lot of battery
2. If all else fails, enable Low Power Mode

Use Low Power Mode to save battery life on your iPhone or iPad - Apple Support

For the first 24 - 48 hours after installing an iOS update, battery usage will be higher as the phone needs to rebuild various internal databases.

Check back in a few days to see whether this is an ongoing or one-time issue.

Three problems I have observed, for 16.1:

1. Battery Status chart is not reflecting the real status: it stated 75% and then 5 minutes later it was 10%, without anything 'active'. Due to historical reasons from 15.0.1, I have learned to switch off all the 'Mobile Data' and 'Background App Refresh', for all my Apps. I did not have any problems with 16.0
2. Excess heat: I did not have any heat problems with 16.0, but now it is excessively hot; like with version 15.0.3.
3. Battery Drainage: I had over 2 days of heavy usage with 16.0. Now with 16.1, I have to charge after 6 hours.

I had to learn all about this after upgrading from 15.0 to 15.0.1 and their after.

I use it to help me understand, gauge, what application is draining my battery. It falls into three camps:

1. Background activities - your downloaded apps have two settings: Mobile Data and/or Background App Refresh' that love to drain your battery; irrespective of wi-fi(router) or mobile-data (my environment switches between 3-4-5G) usage
2. Active use of an application - since 15.0.1 simple activities like receiving a phone call drain the battery excessively, EXCEPT for 15.0, 15.1 and 16.0; some how those three versions worked perfectly where I had +2days usage on a single charge with heavy usage. Using apps with the other version, my battery drained; resulting in me having to switch-off everything!!!
3. iOS application or background activities - there is a lovely icon 'Home & Lock Screen' which is constantly popping up at all hours, where on the chart it shows a roughly 1% battery drain

Saying all this, now with 16.1 the 'chart' does not reflect the status, one moment I am 75% and the next 10%. I have posted a comment in regard to this matter.

I switch between % mode and time mode, to see the 'real-culprit' of my battery drainage.

I would call Apple Store if you just purchase it you have a year warranty defect manufacture cause I have iPhone 13pro also but mine don’t drain like that