The battery chargedischarge current detection apparatus has a power supply circuit powered by a battery mounted on a vehicle and configured to detect a chargedischarge current of the battery by use of a current detecting resistor connected between a negative terminal of the battery and a ground. Various other apparatuses, systems, methods, etc. Between the carbon brush part 8 and the coil end 10, there is provided a heat radiating plate 4 made of metal and adapted to be engaged with the carbon brush part 8. Corresponding apparatuses are also provided.