How long do chemical light sticks last?
Chemical light sticks typically last about 4 years in their sealed foil wrapper; heat and light exposure shorten that.
| Chemical Light Sticks | |
|---|---|
| Unopened | About 4 years in the sealed foil |
| Opened | Use within weeks once the foil is opened |
| Ideal storage | Cool and dark, in the original foil. |
Storage tips
- Light sticks are a backup, not a replacement for a flashlight with spare batteries.
Signs it has gone bad
- Batteries: white crusty residue, swelling or leakage at the terminals
- Bleach: a weak smell; it may no longer be strong enough to disinfect water
- Fuel: darker color, a sour or varnish-like smell, or separation into layers
- Canisters and cylinders: rust, dents, damaged valves or a gas smell