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I don't own one, but have read about those chargers, and do remember they would accept input voltage up to 18vdc. How about using an old laptop charger/power supply? Some of them are 4-5 amp...
Or you can source a 120 to 12 vac 100va transformer (or a 240/24 one and connect it to 120) and buy a bridge recetifier from an electronics parts place. It would be bulkier but very durable.
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