http://www.graupner.de/en/products/c...tcategory.aspx

you need this it's made for the job

LiPo safety cases are fireproof containers designed for the safe storage, charging, and transport of lithium-polymer cells
LiPo safety cases are manufactured in accordance with the F30/R30 class hazard regulations of DIN 4102/EN13501
Integral flame-proof pressure valve prevents the escape of hot gas if a fire should start inside the case
Temperature-resistant filter lid prevents the escape of hazardous residues (soot) if a battery fire starts
Foamed glass shell insulation guarantees physical stability of the case up to temperatures of 1200°C
Temperature transfer protection with quadruple safety measures to prevent ambient fires
Integral cable set for connecting external charger toLiPo cells