Phone case with battery exchangeable OR DIY reuse a battery case and upgrade

[Aap1_MonkeyOne]

Dear reader,

I searched via Google & this forum, for information about the topic.
As always, I think I do something wrong(even using multiple ways to describe), or the info is not there : ))

Uber subject context:
So I have been using https://zerolemon.com/collections/battery-case (Note 4 & Note 9) for years for 2 reasons:
1 I do not like NON bulky phones, so without extra protection for screen edges & the camera
   (I like the little bit extra durable feeling the 10000mAh ZeroLemon cases give)
2 I like the extra battery capacity
First I tough I wanted to have the battery exchangeable in the phone, but not having to turn off the phone and just exchange the case was actually nice : ))
But 1 thing better for me would be a way to leave the case on as much as possible and exchange the battery of the case only.

Since it is time to get a new phone, first thing I did was go looking for rugged phones, found non I trusted in quality and where to my liking.

So went looking for a brand of phone cases with battery and found out it is hard, since most do not seem to have a website... or much tech specs
LOL yes I am so insane that in stead of looking for a nice Android phone first, I want see if I can find a protective bulky case with battery to make the phone usable for me, LOL
Since I tried 5000mAh cases, I found out that a minimum of around 10000mAh(or more) seems most convenient to me, not many brands remain : ((
Found 10000mAh @ (the ones without brand website not included):
https://www.newdery.com
https://zerolemon.com
- Looks like the most phone protection I found (Not pefect products (for me), but best I found, eg I reduced the start loading button by at least 1mm to prevent accidental start of charging, newer version have an nice min 3 sec button push requirement, also used my note 9 for about 3 years the 1 of the cases started to have issues with the internal connector, best guess wire inside, as the connector looks clean and has all pins)

Other finds(this list is longer, but mostly with less mAh or less trustworthy, etc):
https://www.quadlockcase.eu
- Like the idea but 2 huge minus points: only 5000mAh and wireless charging mean huge power loss while charging the phone (read 70% efficient somewhere that would mean only about 3500mAh remains?!?!?)

So in this context I was thinking: What if I buy at least 2
https://zerolemon.com/collections/samsung/products/galaxy-s22-ultra-battery-case-10000mah
or
https://zerolemon.com/collections/battery-case/products/galaxy-s23-ultra-battery-case-10000mah
then:
1 find uber low current loss connectors
2 cut out the battery only (not the electronics)
3 add the connector to battery + DIY cage to put back in the case
4 add the connector to the case electronics
If I can pull it off so I have a good feeling is robust mechanically & electrically : will this work?
My background is embedded software, but still see myself as electronics NOOB, as I only can create simple circuits : ))
So I understand that I ask a question that can be answered if I have more details of the electronics in the phone case.

Subjects questions:
Do typically have these kind of circuits store info about the battery?
So if you put in another battery, it first needs to "learn" about the new battery before it can charge optimally?

(( ; Also any tips or hints to useful brands or solution idea's are very welcome ; ))
(So like big bulky protective cases with internal battery to charge an Android phone with a huge screen)
(LOL, a brilliant idea seems to be: maybe try to DIY the whole case: take a decent 10/20Ah power bank + some mini USB c cable and pour this in some rubber, but in a way I can exchange the powerbank from the case, this way I could should what kind of huge screen Android phone I buy, but somehow this feels like a "bridge to far" for me... LOL)

Greetz, Aap1_Monkey1