Dispose of them as industrial waste in accordance with the Waste Disposal and Public Cleansing Act (Waste Management Law / Ministry of the Environment). For details, please consult a professional disposal company. When disposing of the batteries, insulate them (including used batteries) by, for example, winding tape, etc. on the battery terminals or putting each battery in a separate plastic bag. (Contact between the battery terminals and other metal can cause a short).
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