Connect Battery Error

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I have an SMT750 circa 2010, I changed the batteries this year and now I'm getting the "Connect Battery" error. I get power to the plugs but only on AC, I took out the battery and I read 26V @14 Amps. I've fiddled with connectors to rule that out, I also took some contact cleaner to the battery connect at the back of the unit. I also tried a self test, but it won't perform one due to the battery error. Is there something I can do or do I pitch the unit?

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