Vehicle Battery Charging Device and Method

A vehicle battery charging device includes a controller configured to generate one of a first activation signal and a second activation signal, based on a start-up signal and a battery state information, a continuous charger configured to output first electric energy of a constant voltage level, based on the first activation signal, a pulse charger configured to alternately output a charging voltage and a discharge voltage as second electric energy depending on a preset ratio, based on the second activation signal, a battery configured to continuously charge by receiving the first electric energy or to pulse-charge by receiving the second electric energy, and a battery state detector configured to detect a state of the battery and to output the detected state of the battery as the battery state information.