IERE conducted R&D on lithium-ion battery modeling of battery degradation and safety from operations assuming power storage. The results were presented by Leader Southwest Research Institute (SwRI) at San Antonio WS.（https://www.iere.jp/events/workshop/2024-sanantonio/day2.html） With the increasing introduction of intermittent renewable energy, the need for power storage is becoming increasingly important. Various types of batteries and energy storage systems have been developed and are being introduced for load leveling, frequency regulation, and other purposes. IERE members who are involved in various battery developments will introduce the features and application of the batteries developed, as well as the performance evaluation of mainly lithium-ion batteries. We believe that these lectures will help not only those who are considering installing these systems in the future, but also those who are already in the demonstration phase to operate them more efficiently and economically with a longer operating life.