A method of controlling charge of a vehicle battery includes: determining, by a control unit, whether a high voltage battery and a low voltage battery are charged in a first charging mode, a second charging mode, or a third charging mode; and charging at least one of the high voltage battery or the low voltage battery by controlling a first full-bridge circuit unit, a second full-bridge circuit unit, and a low voltage direct current (DC) converter unit based on the determined first, second or third charging mode.