If you've bought a Kidde FX in the last few years check this recall list. The recall is for 4.6 million manufactured between July 23, 2013 through October 15, 2014.
Kidde Recalls Disposable Plastic Fire Extinguishers Due to Failure to Discharge | CPSC.gov
Kidde Recalls Disposable Plastic Fire Extinguishers Due to Failure to Discharge | CPSC.gov