In order to improve fuel economy and reduce CO2, HEV adopts ISG system as a standard. This ISG systemincreased the electric load that the battery had to bear, and the number of starting increased rapidly. AGM Lead Acidbatteries have been developed and used, but the charging time is about three times longer as the electrolyte amount controlduring formation must be maintained at a higher level compared to conventional lead-acid batteries. In this study, we triedto shorten the charging time by increasing the charging efficiency through the optimization of the formation pattern. Inorder to optimize the Formation Pattern, 10 charging steps and 6 discharging steps were applied to 16 multi steps, and thecharging current for each step was controlled, and the test was conducted under 4 conditions (21 hr, 24 hr, 27 hr, 30 hr). Asa result of simultaneous application of multi-step and discharge step, it was verified that minimizing the current loss andeliminating the sudden polarization during charging contributes to the improvement of charging efficiency. As a result, itshowed excellent results in reducing the charging time by about 30 % with improved charging efficiency compared to theprevious one.