Try to stick with a name-brand one if those exist. Mine was a no-name one, probably a Chinese import, sold by an American retailer.

When mine was recalled, I filled in the web form and they sent me a special latching shipping box, I suppose to handle the hazard of the burning battery. That shipping box was cool, and probably worth more than the heater. It was like a high end waterproof Otter box or Pelican case. So I ignored the recall, kept the case, and dropped the heater off at a battery recycling place. I was happy in the end - not with the heater, ... with the shipping case!