RC Lipo Lithium Polymer Battery Safety Guard Charge Bag The safest way to charge and store your lipos. Protect your workshop, family and home from the hazard of lipo charging. This is a fireproof bag, designed to stop and contain any fire caused by incorrectly charging poorly functioning lipo packs. We always urge all of our customers to always practice extreme caution when charging lithium polymer packs. Never leave a charging lithium battery unattended.