As much as I like the idea after reading about the Note 7 and then a battery fire at DARPA I'm not fond of a giant battery lithium-ion battery in my house.
And if you think this is bad, just wait until batteries get more powerful and there are problems. Be thankful that it only starts a small fire!
Just remember that there are 10s or 100s of Billions of Li-Ion batteries around the world, and having a single one fail catastrophically is still enough to make headlines...
I wonder how the safety of this will compare to gas: http://bloximages.chicago2.vip.townnews.com/qctimes.com/cont...