The PLC (programmable logic controller) plays an important role in the field of industrial automation because of its excellent performance. Its multiple functions include logic arithmetic, calculation, communication, noise resistant and stability. And PC (personal computer) has great ability in rapid calculation coped with the ability to store huge information. In the last 20 years, PC has popularized all over the world because of its cheaper and cheaper price. Accompanied with the popularization of PC and the promotion of the communication technology, Internet has since evolved and been developed, by which we can contact with anybody, anytime and anywhere. The usage of lead-acid battery is increasing in the future. How to improve the charged efficiency of lead-acid battery and enlarge the battery usage life to reduce energy consumption and battery damage is more and more important. In this paper, it is used MITSUBISHI PLC FX2n-32MR to be controlled. The battery is by way of rater and FX-2AD in charging state. The analog and digital data is passed to PLC to be real time monitoring and controlling. Charging is set time and voltage constant to reach optimization charging. On the other hand, using AD590 is to be reference measuring and battery protection in temperature control.