Microsoft Surface Book Performance Keyboard - retail Model 1704

Product Name: Microsoft Surface Book Performance Keyboard - retail Model 1704
I bought two of these Surface Book Performance Keyboards for the 13.5" models over three years ago, they were supposed to be new, but neither would charge. I believe the internal video card is non-functional, as I never recall attempting to use it. It connects to the tablet, always ejected without fail, keyboard keys work, but neither a Book 1 or Book 2 would ever recognize it as a 2nd battery. Condition- Superior, like new, no retail signs of wear.