I have a Dive Extras Nexcell NI - MH charger 42 VDC /3A and need to install a thermistor sensor . The battery is one custom built from a hybrid car module and need to wire it properly so the charger will function . It has a positive and negative plug and single sensor wire . Does the sensor connect to the battery or only the single wire from the charger. . Thankyou Rumdumb