Abstract: A vehicle electrical system includes a battery, a customer connection point, a switch electrically connected in series between the battery and the customer connection point, a computer communicatively coupled to the switch, and a transceiver communicatively coupled to the computer. The computer is programmed to instruct the switch to open in response to a state of charge of the battery decreasing below a charge threshold, receive an input selecting a time limit, and instruct the transceiver to transmit a message to a remote server upon determining that the state of charge of the battery will decrease below the charge threshold in less than the time limit from a current time.

Abstract: An electrical system of a vehicle includes a first battery, a second battery, a first switch electrically connected in series between the first battery and the second battery, an external connection point, and a second switch electrically connected in series between the second battery and the external connection point. The system and a method of operating the system include determining that the first battery will need assistance to start an engine of the vehicle, opening the second switch in response to a state of charge of the second battery decreasing below a charge threshold, and closing the first switch for the second battery to assist the first battery to crank the engine for starting.