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Jonthan Fine adjusted his DN50 up 14.2v to charge Lithium Batteries, Don did nothing with his DN50, The Lithium batteries want to be charged at 14.2 to 14.6 If charged at 13.8 that DN50 charges at ,the Lithiums won’t charge all the way up to 100 percent I would’t think that would hurt anything? My DN50 12v is only for 12v house, it has a separate 24v alternator for chassis.