Why You Should NEVER Leave Power Tool Batteries on the Charger (Retired Firefighter)

A charger is rarely the whole story behind a garage fire—the battery, the heat, the bench, and everything around it can turn a routine charge into a serious hazard. After thirty years as a fire captain, I’ll walk through the warning signs I want every tool owner to recognize before leaving a battery on the charger. I’ll explain why knock-off and damaged packs deserve special caution, why frozen or heat-damaged batteries should not be charged, and how sawdust, fuel, overnight charging, and poor garage placement can make a bad situation worse. I’ll also show how a heat alarm and a safer workbench setup can give you an earlier warning and reduce the risk around your charging area. 0:00 Where garage fires start 0:49 Avoid knock-off batteries 3:15 Retire damaged battery packs 5:07 Never charge frozen batteries 6:52 Heat-damaged batteries in trucks 9:51 Keep chargers off sawdust 10:52 Install a garage heat alarm 12:51 Why overnight charging is risky 14:47 Separate charging from fuel 17:22 Make the bench safe #PowerTools #FireSafety #GarageSafety #BatterySafety #DIYSafety