A typical circuit topology shall consist of either the on- or off-board type battery charger, rechargeable battery pack unit, battery disconnect or junction box, and the DC/DC converter, an inverter, and the plug-in type station electric vehicle charger. In the event of a service call or vehicle maintenance the capacitors within the DC power module must be fully discharged to avoid the presence of any high voltage conditions, this is where the PTC-ICL thermistor plays a critical role in the draining of the charging system.