May I know are you referring to Hilton in Shinjuku?

Most chargers can handle 100-220v these days, but not all of them.

Somewhere on your charger there should be a little area where they list certifications, voltage, watts, amps etc. Can you attach a picture of that?

I would ask the company you bought the scooter from. I’ve travelled internationally with my chair but haven’t had to charge it yet.

I’m going in late March. I have no idea how crowded it is then. And I’m only going to be in Osaka for two days, then Kyoto for another few