A few people have gone to a cinderblock for charging, but truly, it can be any nonflammable surface that can withstand the heat. The fire usually doesn't last long but it burns hot! The cinderblock offers protection from spreading and helps contain any mishap by the simple expedient of covering the block with another nonflammable item such as a couple of bricks, a heavy sheet of metal, etc. The main thing to consider is the chemicals released into the air when a lipo fire occurs. you don't want that stuff in your house, so ventilation is a concern as well when planning on a charging location.Ya, this is Great!, Thank you! I read through the manual for my charger, and it appears to not auto balance, so i need to get an auto balancer. I know Josh and Josh did a video on that, like 20 bucks, Totally worth it!. So i guess its an 80% rule hua? Thats good. Do you have any suggestions for a battery charging setup? Like.... a cinder block or something? (In the event something were to go wrong.)