A portable, lightweight electric vehicle charging device includes a set of connector cables adapted to connect to battery terminals of first vehicle having an internal combustion engine and includes an EV cable adapted to connect via an EV power connector to a charging port of a second vehicle that is an electric vehicle. The charging device receives DC power from the battery terminals of the alternator, converts it to AC power using an inverter, conditions the output of the inverter, and outputs AC power of at least about 50 watts continuous to the electric vehicle charging port. In other aspects, higher levels out output power are provided, up to about 325 watts continuous, as is limited by the configuration of the charging device circuit and the power output of the first vehicle's alternator.