Aux battery

Thanks Ron, yeah I saw the same thing, talked to the manufacturer today. He said they don't make those anymore, but there are still a boat load of them out there. they have moved on to the next generation, series 4400, He did say they are an excellent converter, 'bullet proof' was the term he used, said you can hook a battery to it, if it doesn't have a charger I can hook an independent charger to the battery as long as I disconnect the battery from the rv to avoid cooking anything in the rig. He said the only way to tell about the charger is to go back look at the label and look for option"c" somewhere on the label. I hope this is helpful to anyone else out there with the same situation. I'll let you know if I can find the "C". Thx Ray