What could be the cause of that? It’s happened twice.

I was just going to get a V1 or Plus because I could fly with the battery size for vacation this summer but I just checked Delta, one of the carriers I’ll be flying on, and read this:

“FROM ALLOWED CONDITIONALLY TO JUST NOT ALLOWED

Battery Powered Self-Balancing Personal Transportation Device (Hoverboards)

To ensure the safety of our customers and employees, Delta will not accept the transport of balance gilders, hoverboards, powered skate boards, motorized riding suitcases and self-balancing boards of any type which use lithium or lithium-ion batteries on board its aircraft. These items are prohibited as both carry-on and checked baggage.
Delta reviewed the hoverboard product specifications and found that manufactures do not consistently provide detail about the size or power of their lithium-ion batteries. These devices often contain battery varieties above the government mandated 160 watt hour limit permitted aboard aircraft. While occurrences are uncommon, these batteries can spontaneously overheat and pose a fire hazard risk.”
So bummed!!! I’m about to check the other airlines I’ll be flying on but am curious if others have heard about this AND if anyone has had success shipping a V1 or Plus. Thanks!