Reflex is a patented technology in the United States, which is actually an improvement on the pulse charging method. It is on the basis of pulse charging method to add a reverse discharge, greatly reduce the polarization of battery charging phenomenon, increase the battery acceptable charging current. Reflex is mainly used to charge nickel-cadmium batteries. It solves the memory effect of batteries and can greatly shorten the charging time of batteries. The charging method and the detection of charging state of lead-acid battery are quite different from that of nickel-cadmium battery, but they can learn from each other.