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

After extinguishing an H/E (High Energy) battery fire, the use of a fire containment bag is appropriate for safely handling the potentially dangerous remnants of the battery. Even when the device is no longer smoking or burning, H/E batteries can still pose risks, including the potential for re-ignition or hazardous chemical leaks.

The fire containment bag is designed to securely isolate the battery, preventing any further reactions or leakage from escaping into the environment. This containment measure is crucial, as it allows for safe transportation and disposal of the battery without risking further injury or property damage.

Using an extinguisher would typically be focused on extinguishing flames, and is not relevant once the fire is out. A fire blanket may help in smothering small fires, but it isn't designed to contain hazardous materials. Similarly, while a safety kit can provide general first aid or safety supplies, it doesn’t specifically address the containment of hazardous battery materials post-fire. Therefore, the fire containment bag serves a specialized purpose in this context, making it the correct choice.