Multi-product batch processes use intermediate storage tanks to increase plant productivity and operational efficiency. In this paper, relations are developed for production scheduling models of the multi-product batch processes with storage time constraints of the intermediate storage tank. Numerical formulas are obtained to determine the makespan and the completion times of products on each unit. These results are extended to accommodate the general serial process networks with storage time and the product constraints of the intermediate storage tank. Next, the effects of the location and the number of the intermediate storage tank on the production scheduling are considered. From the above analysis, a MIPL model to find the minimum makespan is proposed. Applications of the developed model are presented with an example.