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This work provides an overview of the consequences of thermal runaway events and mitigation strategies with respect to gases released during these events. The results of recent research on thermal runaway events are explained. In particular, vent gas composition, energy release, flammability, and other hazards are quantified. These results are compared to more common hazardous gases such as methane, hydrogen, and other combustible materials. This comparison can serve as a basis to adapt common safety practices used in other industries to protect people, the batteries, and the facilities that use these large battery systems.