Lithium ion batteries are becoming an increasingly common place energy storage device for both on-grid and off-grid applications from residential to utility scale sites. This online two-part webinar is aimed at educating those with PV designers and installers about the fundamentals of lithium ion batteries. This course provides a structured approach to understanding the fundamentals of lithium ion batteries including construction of the battery cells, battery chemistry, common battery electrolytes and their associated risks, failure mechanisms, and safety requirements.