This article first elaborated the battery charger research backgroundand the domestic and foreign development tendency, has made the briefintroduction to the battery and the battery charger. Then introducedthe fast battery charger design, including the battery chargecharacteristic, the charge pattern, proposed the battery chargerdesign requested and charges the end symbol definite method,elaborated the rapid charge rate method principle, has solved becausethe big electric current charge caused the polarizing voltage, simplyintroduced the intelligent battery charger design mentality. Againthrough an experiment proved the pulse electric current fast batterycharger conforms to user's requirement. Finally used integratedcircuit MAX2003A to design a section nickel cadmium cell fast batterycharger Simply introduced the integrated circuit MAX2003A basicstructure, the pin arrangement and the function, the principle of workand the sufficient flashover characteristic, have listed this chipprogramming method, and has produced this battery charger practicalapplication electric circuit. The experiment proved, utilizationintegrated circuit MAX2003A designs the battery chargerintellectualization degree high, the system work stable reliable, theduration of charging is short, is one practical design method. Key word: Nickel cadmium cell; Rapid charge rate; Polarizing voltage;MAX2003A