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I use LIPO charge bags but I don't think those bags are going to completely stop a fire from spreading if left unattended. Based on what I've read and seen most fires occur when charging a battery (charger overcharges, battery or battery is defective, etc.) In my opinion the bags buy you some time to unplug the charger and get the battery out of the house. These fires burn VERY hot and if left to burn I'm pretty sure the bag is going to heat up and become VERY hot, burning anything near it. If the bag is seating on top of a wooden or plastic table my guess is that wood or plastic is going to start to burn at some point. This is why the caution is given to never leave a charging battery unattended.