Started to think about improving safety and transport of batteries. Currently the batteries are stored in a polymer box, but I am considering some faire resistant lining for the box. Zarges make transport boxes for lithium-ion batteries (as seen in pic above). They also sell Cirrux; fire resistant cushions. This as seen in the video below can be used in card boxes as it has a high resistant to heat, looks great. Should be great for the polymer box.