The term Battery Monitoring (or Management) System is used in at least two different ways regarding LiFePO4 battery banks:

1. cell-level monitoring and cutoff for overvoltage or undervoltage; these are intended to maintain balance between cells of fast, high-current charging, as found in electric vehicles (EVs).
2. bank-level monitoring and High Voltage Disconnect and Low Voltage Disconnect.¹⁾ In an an RV these would be acommplished by the charge controller and an LVD respectively. This simple approach is advocated by T1 Terry, who believes the cell-level BMS is an unneeded expense for Fractional C charging and can do damage by poor design²⁾ or failure.