Robert
My method:
Store the battery's in a plastic box. The battery's are kept on the long side not on the end. This is to reduce the damage. If stored and transport on the end there is a Higher risk of damage to the cell connections.
Battery's are charged on a small table next to the sliding glass door out side those doors there is a concrete patio. If the is a problem the door is opened and the table is pushed out side.
Also I have a charge station the setts on a big welding blanket so the system and battery can be covered and moved out side.
Each charing station as a battery power smoke /fire detector. A 8 lb CLASS ABC dry fire extinguisher is in the area. This will not put out the battery fire but is used to put out the surrounding fire,
For new or unattended battery charging I have an old gas grill the sits in the concrete patio the charging system and battery can be placed inside.
In my battery class at work the first day , Batteries are bombs and we are trying to control the discharge over a long period of time.
Mark