In my opinion charging in a battery box or any kind of box is crazy.

Surely natural air circulation around a battery pack is a must if you dont want it to overheat. Packs already get hot enuff as it is during normal charge at 6 Amps and the foam in a battery box will act as an insulator to hold more heat in the cell.

I wont even put a pack in the box after charging to ensure it cools down properly.

IE i charge a couple of packs before heading to racing to ensure i am ready to start, so when i travel to the track i usually put them on the floor of the car to make sure they are still able to cool down.

Anyway just my opinion....