The short summary and promotional piece accompanying a creative work is about for battery charger system using ZCS (PWM) Resonant Converter Dc-Dc Buck. The aim and scope of this work to investigate the high efficiency of charging for battery level. The idea is forced to gain high efficiency, low circuit volume, minimize switching losses and satisfactory performance. The brief discussion of battery charger system and on use able functional methods. The short study of circuit descriptions, operating modes, output voltage gain and normalized voltage gain is also summarized. This high repetitious...