Lithium ion batteries do overheat and burst into flames. However, it's generally due to faulty charge controllers pumping too much current through the cells. It

Lithium ion batteries do overheat and burst into flames. However, it's generally due to faulty charge controllers pumping too much current through the cells. It won't be caused by having the laptop power on in a backpack. http://www.youtube.com/watch?v=ixIOEPnsgbI http://www.youtube.com/watch?v=ixIOEPnsgbI