I've had a few RC plane batteries go on me, they go from fine to OMG!WTF! in about 5 seconds. And these are as big as a deck of cards. I accidentally punctured a tiny one the size of a thumbnail in my house, and I tossed it out the front door. It started hissing and smoking before popping into flames. And the smell, oh the smell...stuck around for days.
Lithium batteries are at their most dangerous when charging, or under extreme discharge. So having one charging in your attached garage could be catastrophic pretty quickly. I'd make sure I had a really good fire alarm system in place. A house fire with one of those fuelling it would be impossible to extinguish quickly.
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