Sorry not for responding sooner.
My battery system came with components that was designed for operating as a unit, not add pieces and parts as you go.
The patented BMS systems manages charging, discharging and output controls, as well as provide statuses of Lithium Ion battery packs and all individual battery cells. They also provide critical safeguards to protect Lithium Ion batteries from failures and damages.
The central processing unit (CPU) of the BMS system interfaces with sense boards (daisy chain) to obtain voltage and temperature data from each individual cell, and it interfaces with shunt sensor to read pack current. The CPU is powered by a 12V DC source. It detects ground fault error, calculates the State-Of-Charge (SOC) of the battery pack, provides video output signal for display of pack voltage, pack current, SOC level, as well as alarm status. The CPU also provides alarm outputs for protection against over-voltage, under-voltage, over-current and over-temp conditions. EMS-CPU comes with three parts: the CPU itself, a shunt sensor and a computer cable connecting between the CPU and the sense board strings.
The system as a whole looks like this.
Senseboards connected to all cells (daisy chained).