Old ammo can bought at a military surplus store. Bought my lipos in 2011 or 2012 and even let them sit for a few years (in the ammo can). I did check on them, on occasion and charge/discharge them about once a year during that time. I did have one puff and I dipsosed it at the local Best Buy collection box. I never store them when they are not in the proper storage mode from my Cellpro charger.