What is used after extinguishing an H/E battery fire once the device is no longer smoking or burning?

The correct answer highlights the importance of safely containing and managing lithium-ion battery fires. After extinguishing a fire involving a hybrid/electric (H/E) battery, it's essential to ensure that no residual heat or potential reignition risk remains. Using a fire containment bag (FCB) is a best practice in these situations as it is specifically designed to safely contain a damaged battery, thereby minimizing the risk of further combustion and isolating it from other materials.

An FCB typically has heat-resistant and fire-retardant properties, allowing it to hold any hazardous materials that might still be present in the battery after extinguishment. The bag provides a safe storage solution until the battery can be properly disposed of or examined by professionals.

While other options, like a fire blanket or water dousing, may have their uses in certain fire scenarios, they do not address the specific risks associated with lithium-ion battery fires post-extinguishment. Fire extinguishers, although vital in active fire suppression, do not serve the containment purpose needed after the fire has been controlled. Hence, the practice of using an FCB is crucial to ensure safety and proper handling of H/E battery incidents.