A supervisor monitoring system for autonomous test supervision is presented. A system can include a first supervisor monitor (SM) and a second SM, each configured to simultaneously monitor one or more tests conducted by one or more testing apparatus. First and second SMs can be configured to verify the other's integrity throughout a testing procedure, providing a failsafe system. The first and second SMs can be interlocked so that if the first SM detects a fault at the second SM, the first SM can interrupt testing monitored at the first SM, and can also interrupt testing monitored at the second SM, and vice versa. An SM can be configured to control a safety relay configured to couple a power channel of a battery exerciser to a battery cell, and be configured to monitor input at the battery exerciser from the cell to determine whether a test constraint has been violated.