I would phone your airline and ask. I’m pretty sure that they have a very small thin wheelchair on board that can go up and down the isles of the aircraft and a crew member will assist you to the toilet.

New Wheelchair Rental at Haneda

Some of you here are probably aware of this, but a new wheelchair rental service has started at Haneda Airport Terminal 3. They rent normal manual wheelchairs as well as a light-weight power wheelchairs that is foldable and self-standing.

You can get it at the airport, take it anywhere while you are traveling…

Read more

It does not have English site yet. You can write your request from here:

https://ut-haneda.jp/wheelchair_stroller_rental_list/#offerform

https://ut-haneda.jp/wheelchair_stroller_rental_list/

Hi, thanks so much, and thanks for the spare battery advice too. Were you able to charge your battery when you were out and about?