The Broadcom AS38-H39E-B13S multi-turn encoder does not need a battery as the Wiegand-based energy harvesting technology generates its power. The magnet mounted on the shaft moves in tandem when the shaft rotates. The energy harvesting coil module reacts with the moving magnet field, generating count pulses and energy. The beauty is that the same amount of energy is generated independently of the speed of rotation. The generated energy is sufficient to power the revolution tracking circuitry. Therefore, no miss counts occur even in the absence of an external power supply.