Use 13 high-resistance dividers into an 16->1 analog switch, buffer the output of the switch
with an opamp follower.
Can you find me a 16>1 muxer, like the xx4067, that can do 50 or 60 volt.
This clever circuit, posted by another member (can’t find the link), brings each cell voltage down to muxer/MCU level. Limited to 6-8 cells (opamp supply limit).
Bal Charger.pdf (35.3 KB)