So finally got everything set up. This is a really niche item but has some very positive features and use cases when combined with certain items.
So obviously you can use common l3 or clone FMA external battery packs which is a VERY nice feature.
The other thing it now allows me to do is use one of these
Grid Down Power CableSo now I can in a pinch use common power banks or use the external battery boxes.
With the extended runtime and not having to worry about batteries ever puking inside my expensive NVD I think this is a very nice item. Combine that with this off the grid power cord and you really have a nice light weight shtf unit that can be powered in a variety of ways with extended run time. With how common battery banks or solar panels generators ect are I think this is a nice set up with a variety of uses.