Lithium batteries power smartphones, laptops, electric vehicles, power tools, and countless everyday devices—but which lithium batteries are dangerous ? Certain battery chemistries, damaged cells, manufacturing defects, overcharging, overheating, physical damage, and improper storage can increase the risk of thermal runaway, fire, or even explosion. Understanding these risks is essential for consumers, businesses, and safety professionals handling lithium-powered equipment. International Fire and Safety Journal explores the different types of lithium batteries, the conditions that can make them hazardous, warning signs of battery failure, and practical measures for safer use, charging, storage, and disposal. Learn how to recognize potential battery hazards and take appropriate precautions to reduce fire risks in homes, workplaces, vehicles, and industrial environments.