No, the original Ursa Mini 4.6K does not have internal ND filters. You will need to use external 4x5.65 filters or screw-on NDs for exposure control.
The camera does not include an internal battery. Using a standard 95Wh V-Mount battery, you can expect approximately 2 to 3 hours of continuous operation.
No, the Ursa Mini 4.6K requires CFast 2.0 cards for recording. It is not compatible with standard SD or UHS-II cards.
While it has 15 stops of range, it is a cinema sensor optimized for ISO 800. It is best used with controlled lighting rather than extreme low-light environments.