According to the problems of overheating, underheating, slower speed happened in the course of, the author designs the new lead-acid battery which take the atmega16 monolithic integrated circuit as the core intelligent battery charger. The paper has been based on sugeno the inference fuzzy PID control algorithm, the result is that it will raise the charge speed, reduces the battery loss, and will help realize lead-acid battery the charging-up intellectualized control.