Battery energy storage is an evolving market and the fire safety aspect of this technology has become an emergent, hot topic in the utility industry. Over the past several years, Duke Energy has constructed, operated, and owns 9 Lithium-Ion battery energy storage D-Tied assets totaling 40Mw with additional sites coming online in 2022. During our operations experience, we have learned a lot about storage container design, fire safety specifications, and best practices of fire safety trainings. In turn, we applied those learnings to develop industry-leading fire safety systems and training programs. This presentation will cover the dangers of Li-ion batteries, lessons learned from industry fire safety events, safety systems Duke Energy has deployed at current battery sites, and the Duke Energy First Responder Training program.