Many thanks for your kind replies!
Funny that you already thought about doing so. If you do then i might also build one of your boards for that purpose only since i trust your exceptional abilities in this field.
It might be an idiotic question (i am not so good with this stuff) but it wouldn't be possible to connect with your board via Bluetooth to the stock android app or?
What i am looking for is on one side intelligent automated control of my active balancer + still being able to do the same things (monitor and change settings) i can do now via the phone xiauxiang app without having to rely on a computer r pi or wifi.
Could your board somehow share the UART with the Bluetooth adapter? ? Guess not..
If you want to use bluetooth you would probably want to use the ESP32 - you might look previously in this thread as shadowsteve has already done this. Using the ESP32 it would be pretty easy to control it via an android app. There are a ton of vids on youtube showing how to control a relay (to turn the active balancer on/off) with the ESP32.