Flying with an electric bike.. From FAA..

The short version - you can fly with an electric bike but the battery cannot fly.

https://www.ebikes.ca/product-info/ligo-batteries.html

Reads to me like you sit with it in your seat it burns you first..
flight crew can put you on fire out, in the seat, ,
where if it's a fire in the cargo hold everybody dies

Solid state lithium batteries should make that problem go away.