Custom Battery Design questions.

[tllim]

I've been using my PPP as a daily driver now for quite awhile and utilizing the S20 Ultra battery case mod.   The combination of 3000mAh internal battery and the 6000 mAh case battery gives me enough for my normal usage.  

Now, I have a strong electronics background but have little experience in lipo batteries, so my question is this:

I've looked at the schematics and it looks like 3 of the 4 pins on the J7 battery slot are connected: +, GND, and TS.  + and GND are self explanatory.    TS looks like its a thermistor connection to monitor the temperature of the batteries.   If that is correct, then there are several larger "3 wire" lipo batteries that I could utilize, or make my own with individual cells and the appropriate balancing circuit. 

So, my questions. 

Can I install a custom battery into the pinephone using the same battery connectors, and will the software/hardware be able to deal with the larger capacity of the batteries?  

For those with experience with lipo batteries, is it really that simple, or is there more to consider other than temperature and balance?

Thanks in advance.

Edit -  I linked to the PP schematics, not the PPP.  Fixed.

You can do so, just reference the PinePhone keyboard battery portion schematic.