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What is the actual model number of the Xantrex unit you have? Do you have a small digital multimeter for some testing here? About $20 or so at most automotive or hardware stores and easy to use. I can direct you in this. Please keep in mind that even new batteries go bad on a fairly regular basis, but they can be load tested and checked to see if they have a shorted or open cell which would prevent them from being charged. Get back to me with the above info and I can help you sort this out. All follow ups on this question are included in our fee and expected here.