I am confused as to the availability AC adapters for Nikon cameras. I have a D7500 which supposedly uses a EH-5c adapter. However that adapter seems to be discontinued. The EH-5b is supposedly compatible with the D7500, but most places are out of stock. It seems the only place I can get it is directly from Nikon. I apparently also need an EP-5b connector as these newer AC adapters are connected through the battery port. Has there been some issue with these adapters? The new EH-5c is already discontinued? I wanted to use the adapter (EH-5) for my old D-90, but Nikon is saying it might damage the camera.