A battery charger for supplying current to a vehicle battery, the battery charger comprising: a processor; a pair of battery cables to detachably connect with the vehicle battery; a charger circuit to receive an input current from a power supply and to output a battery charging current to the vehicle battery, wherein the charger circuit is operatively coupled with said processor and is configured to selectively supply the battery charging current to the vehicle battery via the pair of battery cables; a sensor operatively coupled with said processor to monitor a parameter of the vehicle battery to yield a monitored battery parameter; and a wireless data transceiver operatively coupled with said processor to enable the battery charger to communicatively couple with a portable user device over a communication network; wherein the processor is configured to transmit, via the wireless data transceiver, said monitored battery parameter to the portable user device, in order to enable the portable user device to render, based at least in part on the monitored battery parameter, a graphical user interface to display a state of charge or a state of health for the vehicle battery; wherein the processor is configured to receive, via the wireless data transceiver, a control command from said portable user device, the battery charger configured to output the battery charging current to the vehicle battery via the charger circuit upon receipt of the control command; wherein the charger circuit is configured to supply a predetermined output current to the vehicle battery via the pair of battery cables in accordance with one of a plurality of selectable charging modes; and wherein the battery charger is configured, based at least in part on the control command, to: supply the predetermined output current to the vehicle battery via the charger circuit; or discontinue supply of the predetermined output current to the vehicle battery via the charger circuit; characterized in that said plurality of selectable charging modes includes a first charging mode where the predetermined output current is a battery charging current and a second charging mode where the predetermined output current is a battery boosting current to start an engine coupled to the vehicle battery. a processor; a pair of battery cables to detachably connect with the vehicle battery; a charger circuit to receive an input current from a power supply and to output a battery charging current to the vehicle battery, wherein the charger circuit is operatively coupled with said processor and is configured to selectively supply the battery charging current to the vehicle battery via the pair of battery cables; a sensor operatively coupled with said processor to monitor a parameter of the vehicle battery to yield a monitored battery parameter; and a wireless data transceiver operatively coupled with said processor to enable the battery charger to communicatively couple with a portable user device over a communication network; wherein the processor is configured to transmit, via the wireless data transceiver, said monitored battery parameter to the portable user device, in order to enable the portable user device to render, based at least in part on the monitored battery parameter, a graphical user interface to display a state of charge or a state of health for the vehicle battery; wherein the processor is configured to receive, via the wireless data transceiver, a control command from said portable user device, the battery charger configured to output the battery charging current to the vehicle battery via the charger circuit upon receipt of the control command; wherein the charger circuit is configured to supply a predetermined output current to the vehicle battery via the pair of battery cables in accordance with one of a plurality of selectable charging modes; and wherein the battery charger is configured, based at least in part on the control command, to: supply the predetermined output current to the vehicle battery via the charger circuit; or discontinue supply of the predetermined output current to the vehicle battery via the charger circuit; characterized in that said plurality of selectable charging modes includes a first charging mode where the predetermined output current is a battery charging current and a second charging mode where the predetermined output current is a battery boosting current to start an engine coupled to the vehicle battery.