A hand full of us have experienced lipo fires. In my case, I followed all the rules and destroyed a fire safe and almost burned my house down. I have two kids and the new nursery is directly above my shop.

A long time ago, I read about people filling garbage bags full of sand and suspending them above the charging batteries. We use salt water to kill lipos before disposal. There are garage fire suppression systems that have the chemicals that treat the ABC's.

I plan to build a metal enclosure with a water proof basin. My dad is a retired metal shop teacher, we have a full fabrication shop at home. My question is, is it better to submerge the batteries in water if they go off, or have one of these fire extinguishers above it. My fear is that the fire extinguisher won't last long enough to put the lipo out, they take a while to do their thing. Should I use salt water? It would be easy to suspend a few gallon milk jugs filled with water above the batteries. If there is a significant fire, its going to melt the containers and flood the basin.

To store regular batteries, they would be in a tuppeware container in the bottom of the enclosure. This way, if there was a fire, it wouldn't ruin all the batteries.

This already may exist commercially, love to not have to build it myself.

Your thoughts?