Abstract: The present invention relates to a cycle battery output control device, more particularly to a control device precisely monitoring the battery output and effectively extending its life, comprising a central control module, a battery module, an output module, a memory module, and a data module; characterized in that a low-voltage detecting unit of the central control module acts as a switch between battery modules to timely control the function of the output module, and count the number of times that the detecting unit monitors the cycle switching output route with the previous battery at any time to assure the exhaustion of the electricity storage of the previous battery module, and working with the voltage indicating unit to timely turn on or off the light and correctly indicate the exhaustion of electricity storage of the battery module and the charging indicating unit to alert a blinking light to show the status of switching to the last battery module for the cycle switch in order to attain the effect of p