Published September 09, 2019 18:05 Does my CO2 cartridge have a lifespan, or expiration date I need to use it by? Yes, it does. The CO2 has a 5 year life span. You can find the expiration date on the top of the cap. Related articles What's the difference between exchange vs back up carbonating cylinders? What do I do when my carbonating cylinder runs out of CO2? Are CO2 cartridges safe for the environment? What's the environmental impact of releasing CO2? If I want to carbonate my water and store it for later, how long can I expect it to store before going flat? How do you get a CO2 refill when there are no exchange stores in the area?