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[Richard230]

My son-in-law thought it would be a good idea to charge a small motorcycle lithium battery that was completely dead as the last time it was charged was 6 years ago. And he decided to charge it with a 6-amp car battery charger. Naturally, he almost burned down their house, but fortunately caught the melt down just in time. Not good idea!     I guess he now loves the smell of lithium gas in the morning. 
 

[togo]

http://batteryuniversity.com/learn/article/safety_concerns_with_li_ion

Scroll down to What to Do When a Battery Overheats

TL;DR

get the lithium away from anything flammable, get it out of doors. 

get a class D fire exinguisher, water may work for smaller batteries