Comment by Analemma_
Lugging an entire suitcase full of 1 kWh worth of batteries might not technically be against regulations, but I imagine you'd be signing yourself up for a long series of headaches at the security checkpoint anyway. To be honest, if I knew that security wouldn't stop me because "it's not technically against regulations", that's exactly what I would do if I wanted to bring down a plane.
Right, that's basically the problem, if one wants to travel by air with an ebike without hassle, there's no real option to do so.
There's the Ligo 10X (https://ebikes.ca/product-info/grin-products/ligo10x-battery...) which makes 99Wh battery packs that can be connected together, but otherwise it just seems like rules lawyering.
There really needs to be standardization of battery packs for ebikes instead of proprietary ones, so that one could rent a battery at their destination.