I used to keep all my electric glider nicd packs in a plastic lunchbox my daughter retired (complete with winnie the pooh ), the type that has good clips on a hinged type lid. one day I closed it afetr I took a battery out, went for a flight, and when I got back there was a scorched plastic smell. I hadnt seen that one of the battery leads had poked out and when I closed the lid it stripped the covering nd shorted the leads which result in a hole melted in it that a rat could race thru The guys all laughed, said I needed a more suitable box but it destoyed my best 12 cell pack [:@]