Wow, I didn't believe it until I tried it. I have an Odyssey 2018.
Conditions: I pulled the battery out of the remote control.
Process:
- Pull out the actual physical key from remote.
- Opened the door manually (maybe that triggered something in the car to know I am using a physical key to open door).
- Placed the remote next to the car start button.
- Pressed the unlock key on the remote and the start button on the car at the same time.
- It actually started the car. (I took the batter out of my remote, so NO BATTERIES).
Hope this helps others when lit battery dead in your remote.