Depending on the type of fire extinguisher, most portable fire extinguishers contain powdered CO2. Other extinguishers may use water, halon, halon alternative clean agents, or dry or wet chemical. The bottom line is it’s just not safe to …
If you learn that your current extinguisher needs a replacement, the next challenge will be what to do with it. Note that these devices have pressurized chemicals. As such, you cannot simply throw yours in the garbage. Instead, you should take several steps to ensure that you are disposing of it safely.
Can Fire Extinguishers Be Kept Outside? (Essential Reading!)
No. Fire extinguishers are tough but harsh UV rays will dry out the hose and other plastic parts. Direct sun will fade the labeling, which may not seem like a big deal but in a safety inspection, that extinguisher would fail .
Therefore, do not throw any fully or partially charged fire extinguishers in the trash if you’re done with them. They are likely to be mishandled and suffer some form of mechanical injury. This may result in a very dangerous outcome. Give Your Empty Fire Extinguishers to a Recycling Facility
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Reference:
https://www.usfa.fema.gov/
https://en.wikipedia.org/wiki/Fire_extinguisher