BATTERY MONITORING SYSTEM AND METHOD

A method of monitoring a battery system (42) utilized within an aircraft propulsion system is provided that includes: providing a parallel electrical circuit having a first and second battery units (38A, 38B) and first and second electrical contactors (60A, 60B) disposed in a parallel electrical circuit, positive and negative bus connectors (60A, 60B) electrically connected to first and second legs of the circuit, and an electrical device (34) electrically connected to the positive and negative bus connectors (56, 58). The method further includes controlling the first and second electrical contactors (60A, 60B) to be in a closed configuration; using a first voltage sensor (62A) to determine a first voltage across the first battery unit (38A); using a second voltage sensor (62B) to determine a second voltage across the second battery unit (38B); using a bus voltage sensor (66) to determine a bus voltage between the positive and negative bus connectors (56, 58); and monitoring the battery system (42) using the first, second, and bus voltages.