NiMH from hell
The gib board lid has a f/glass covering and a 100mm hole in the end, which is covered with glass cloth as a flame arrestor,- the same as the box lid. The lid is left unsealed when charging to allow gasses to escape if necessary in case of a meltdown. The charging leads come through a small hole in the end of the tool box.
The idea is to slow things down to give you time to react, as you will not stop a LiPo fire, (being a chemical reaction when the contents are exposed to air.) Nothing will put it out till the reaction has finished. I always have it handy to a window or door so it can be thrown outside. Not a lot you can do about the smoke, it's controlling the flames which is the necessary bit.
One mod I'll be making is to replace the plastic lid handle with a large wooden one for obvious reasons. I have a number of chargers, the latest being an Imax B6 Evo which can have 10 batteries programmed in to make it almost a 1 touch operation. The genuine Imax and Sky RC and GT Power chargers which I've used for years have been very reliable, and have a temp sensor port (settable cut off temp alarm) which is an extra safety feature for early warning of a problem. These cover most batteries and are ok for LiPos up to 5s. lots of chargers out there to chose from though.
I have some very old LiPos which I might build another box to test with. Only problem is the massive amount of nasty smelling smoke which happens when you let one off (have to wait till the neighbours are out and the wind's right) Lol I'll do a vid If I decide to light one up.
JB