Why does my torch battery compartment show corrosion or residue?

White, green or crusty residue in a torch battery compartment usually means a battery has leaked or the torch has been stored damp. If you see corrosion, stop using the torch until the compartment has been made safe to inspect.

1. Remove the batteries carefully and avoid touching the residue with bare fingers. Expected result: the compartment should be empty and the leak source visible.
2. Check whether any battery is swollen, damaged or stuck. Expected result: all batteries should come out freely. If one is stuck, do not force it.
3. Look at the contacts and spring for heavy corrosion, broken parts or moisture. Expected result: lightly marked contacts may still be usable, but badly corroded parts can prevent safe operation.
4. If the torch design allows gentle surface cleaning of accessible parts, use a dry cloth only after removal of the batteries. Expected result: the compartment should be dry before any new batteries are fitted.
5. If corrosion is heavy, the battery is stuck, or there is any heat or leakage, stop using the torch and contact the retailer or store where it was purchased. Do not scrape, pierce or open the product.

Battery leakage can damage the torch and may affect safe contact. It is better to remove the unit from use than to keep trying fresh batteries in a compromised compartment.