Never charge a Lipo battery without one of these! Designed to contain a fire should one break out while your battery is charging. These bags are made from a fire retardant woven fiberglass fabric and have a velcro enclosure to keep batteries inside. "Case" style is ideal is slightly larger than the regular case, for larger packs that do not fit well in conventional charging bags. We highly recommend you follow all Lipo safety guidelines and that you never leave a Lipo battery unattended while charging. For general Lipo safety as well as tech tips and charging information check out our section on Lipo Battery Basics.