We recommend charging Duracell NiMH rechargeable batteries only. Do not attempt to charge non-rechargeable batteries. Misuse could cause batteries to rupture, causing personal injury or damage. Indoor use only. Dry location use only. Risk of electric shock. Never disassemble or alter any part of the charger or batteries. Charger or batteries may become hot during charging and will cool down when charging is complete. Not recommended for use by children.