They have also been the cause of fire[0] on the Mir space station. They make for a reasonable emergency oxygen supply (no working infrastructure required), but

They have also been the cause of fire[0] on the Mir space station. They make for a reasonable emergency oxygen supply (no working infrastructure required), but you don't want to use them regularly due to the fire risk they represent. [0]: https://www.nasa.gov/feature/25-years-ago-fire-aboard-space-station-mir https://www.nasa.gov/feature/25-years-ago-fire-aboard-space-...