At room temperature and if unused, the WoodsCan Hornet rechargeable air horn will only lose 10% of its charge per year, making it a reliable addition to an emergency kit or in a wall-mounted air horn emergency station. When it is completely discharged, it will fully recharge in three hours, less if already partially charged.
Disposable gas canister air horns, on the other hand, tend to leak their contents over time, making them unreliable in the long term.
