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Hi,I'm Miranda, and I'll be happy to help you with your question.
After researching, the only place I've found an 18-volt HD-DC Coleman Powermate charger for model PMD8146 is on Ebay. The prices range from $34.99-$59.99. Here are a few links to some auctions that are currently going on for this type of charger. All three of these are from the same seller; however, he is offering a $10.00 refund if you have an old charger you want to send in to him.
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