Unfortunately it will be very difficult to find any batteries for that device since it is 9 years old. Your best option is to get any battery you are able to find, get whatever data you need from the device and then purchase a newer device that will be suitable for you. Any battery you find will have been on a shelf degrading for years at this point and cannot be reliable.
I agree with the others. Every phone requires its own specific battery, so manufacturing of new batteries for any given phone doesn't last long. You are not going to find any fresh batteries for something as old as the Note 4.