I just installed a new battery if I let my car sit a couple of days the battery on 1998 Dodge Stratus

runs down I tested by removing the negative cable while running and the car still runs so it isn't the alternator. Everything seams to be shut off when I turn the car off so I don't understand why battery keeps loosing a charge after a couple of days while it sits

Asked by for the 1998 Dodge Stratus