Series lipo battery charging with TP4056 modules



Ok, I am trying to make a variable voltage battery bank using a bunch of salvaged lipos. I already have a lot of TP4056 modules to charge individual cells but the Arduino forum says one should use isolators for each board. Is there any way to avoid needing an isolator for each board? I’ve looked at some options also on Digikey but I’m not really sure what parameters I would need for approximately 5V@0.25A.