A battery pack control apparatus is provided with first, second and third monitoring devices, a battery pack control device, first and second communication devices, and a first electric power consuming device. The monitoring devices are connected to the single battery cells of a battery pack to monitor a state of the single battery cells. The battery pack control device communicates data related with the third monitoring device through the first communication device having an electric insulating quality and with the first monitoring device through a second communication device having an electric insulating quality. The second monitoring device communicates data with the first and third monitoring devices. The first electric power consuming device consumes an amount of electric power at a single battery cell connected to the second monitoring device. The amount of electric power corresponds to a communication occurring at the second communication device.