redilast wrote:So basically I'd run a lead from each battery + and - to the + and - of the charging board PCB and it would treat that cell or cell group as if it were an individual 3.7v Li-ion and not a 48v pack.
Yes, but the individual chargers must be designed as isolated, meaning that none of hte output wires connect to any of the input wires.
Quite a few things have one of the input wires connected to one of the outputs (usually neutral/ground/negative). As soon as you connect non-isolated stuff across cells, you instantly short out the cells, with damaging (or even catastrophic) results.
This way there is no need for balancing with bleed resistors and no need to have a circuit board hooked up with parasitic drain that could one day kill the pack.
You might still want to only plug the chargers in when actually charging, as their output stages might not be completely drain-free.
There's more info in a few of the threads in this search
https://endless-sphere.com/forums/searc ... mit=Search
but there's lots of irrelevant ones too.