Someone made an AC battery that can power and recharge using V-Mounts

Not sure how something like this didn't exist already...

Has anyone here used this thing, or something like it? Looks like they basically added AC Power and battery plates to one of these

Specs listed on the page:

600Wh Internal Battery

User-configurable up to 2400Wh+

External V-Mount / Gold Mount Battery Plates

External Batteries Charge Internal Battery & Power AC / DC Power Ports

External and Internal Batteries Can be Charged via External AC Wall Power

Seamless Switching from External to Internal Power when Swapping Batteries

120v AC Power Out (500w Continuous, 1000W max)

24v DC Power Out via 3-Pin XLR

12v DC Power Out via 4-Pin XLR

USB Power Out Ports