A CO2 fire extinguisher is a reliable tool for extinguishing Class B and C fires. However, its effectiveness depends on the condition of the CO2 cartridge. A depleted cartridge can render your extinguisher useless in a fire emergency. https://medium.com/@shreefireservices123/how-to-check-if-your-co2-fire-extinguisher-cartridge-is-full-386bdb7f97d9