Arrived yesterday. It includes a slip-on aluminum cover for the front of the pack when not installed and a screw on rear cover for the USB port that is identical to the one on the stock battery pack. The back end of the pack also includes a rotating sling or lanyard attachment ring. Combine this with a screw-in carabiner clip D ring for the tripod socket and you have a convenient carrying strap/sling two point attachment for the light as with the extended battery pack the light is about 60 ounces or 3.75 pounds. The added weight and length shifts the balance point for the light on the handle from the first finger position to the second finger, so a fairly minor shift.
Below is a diagram I found on Reddit showing the increased run times for the light with the standard versus extended battery packs.
Very little info seems to be out there concerning extended battery packs from manufacturers who have them available including Nitecore who has long had a version available for many of their TM Tiny Monster series of lights.
