Typical Battery charger mainly consists of two stages: AC to DC stage employing boost or interleaved boost converter where power factor correction is taken care by employing suitable control technique and boosting voltage level to an intermediate dc bus level. The second stage is DC/DC stage where the voltage is regulated according to the battery requirement and provides the galvanic isolation for onboard battery chargers. This paper discusses about battery charger consisting of interleaved ac/dc boost converter with average current mode control technique combined with an isolated DC/DC converter. The first stage involves in making the input power factor acceptable to the standards and regulating dc link bus voltage and the second stage provides galvanic isolation. In addition the dc-dc converter achieves ZVS turn-on, ZCS turn-off for the inverter switches and ZCS turn-on, ZCS turn-off for the rectifier diodes, thus improving the efficiency of the circuit. The prototype is simulated for 200 watts using PSIM 9.1. From the results, the overall efficiency of the battery charger obtained is around 94.7% with improved input power factor of 0.95.