my dads 2003 e46 330ci 2 door automatic has some electrical problem. the battery goes dead within hours, and there is a noise near the a/c under the radio in the console it sounds like a small winding motor. tried charging it and if i leave it sitting the battery goes dead and cant start the car. without the alternator there is 15volts and with there is 19volts. also noted the battery was serviced before i got it, and they only serviced 5 cells out of 6 because the 6th was under the cable. anyone know what the problem is? thanks ahead of time.