Lithium battery? 
I'm assuming you're joking, but the roll eyes thing has me wondering.
You can take it lightly if you want to. Recently, a friend of mine came home to discover her e-cigarette had been gotten and chewed by one of her dogs. Burn marks and small holes on the linoleum floor indicated what could have been a very bad outcome. Several days later, she flipped up the couch to discover part of the covering underneath had burned and the wooden leg on that corner had also gotten flame marks on it. The hole in the covering is the size of a grapefruit.
So, just in case you're not joking, perhaps you should reconsider what can happen.
Sorry for the thread drift. Too sad about the fire.
John Henry
