You MUST provide a way for the BMS to shut down the source (charger), and the load, DIRECTLY!

Otherwise, your cells are NOT PROTECTED, and will not be balanced.

You MUST disconnect the battery from EVERYTHING else before installing a cell board.

Use a safety disconnect to open the battery circuit.

A cell board WILL be damaged if installed to a battery that is still connected to a load or a charger.

A cell board WILL be damaged if connected backwards to a cell, even for a split second.

If a cell board is damaged, discard it.

A DAMAGED CELL BOARD WILL DRAIN ITS CELL!