This sounds to me like the battery data cable is not connected quite properly, or your battery is faulty. This is pretty typical of a sensor not communicating toThe MacBook Pro Battery has 2 battery connections. The first is the small cable and the second is the large T5 screw, which forces the actual power connections. I would verify the cable is seated properly on both ends, and that the little latch holding it in place is present, and closed.
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