A method for monitoring a battery source of a vehicle, the method comprising: determining, by a control unit , an ON condition of one or more accessory devices ; and for each accessory device of the one or more accessory devices that is in the ON condition during a vehicle ignition OFF condition while having been selected, in user preferences, to be in an OFF condition during the vehicle ignition OFF condition: switching , by the control unit , the power source of the accessory device in the ON condition from a primary battery source to an auxiliary battery source ; receiving , by the control unit , current flow through an auxiliary battery source from at least one current sensor powered by the auxiliary battery source ; comparing , by the control unit , the current flow with a predetermined threshold; if the current flow detected by the at least one current sensor surpasses the predetermined threshold, disconnecting , by the control unit , the accessory device from the auxiliary battery source and the primary battery source ; and switching power source of the accessory device from the auxiliary battery source to the primary battery source to enable powering of the accessory device by the power source at vehicle ignition ON condition. determining, by a control unit , an ON condition of one or more accessory devices ; and for each accessory device of the one or more accessory devices that is in the ON condition during a vehicle ignition OFF condition while having been selected, in user preferences, to be in an OFF condition during the vehicle ignition OFF condition: switching , by the control unit , the power source of the accessory device in the ON condition from a primary battery source to an auxiliary battery source ; receiving , by the control unit , current flow through an auxiliary battery source from at least one current sensor powered by the auxiliary battery source ; comparing , by the control unit , the current flow with a predetermined threshold; if the current flow detected by the at least one current sensor surpasses the predetermined threshold, disconnecting , by the control unit , the accessory device from the auxiliary battery source and the primary battery source ; and switching power source of the accessory device from the auxiliary battery source to the primary battery source to enable powering of the accessory device by the power source at vehicle ignition ON condition. switching , by the control unit , the power source of the accessory device in the ON condition from a primary battery source to an auxiliary battery source ; receiving , by the control unit , current flow through an auxiliary battery source from at least one current sensor powered by the auxiliary battery source ; comparing , by the control unit , the current flow with a predetermined threshold; if the current flow detected by the at least one current sensor surpasses the predetermined threshold, disconnecting , by the control unit , the accessory device from the auxiliary battery source and the primary battery source ; and switching power source of the accessory device from the auxiliary battery source to the primary battery source to enable powering of the accessory device by the power source at vehicle ignition ON condition. <EOS>