Hello,
We use a 21700 battery and an arduino-like controller and a cable that breaks when dropped to the ESC.
The speed is divided into 16 steps and are applied by touching two fingers of a glove.
Does it work well for you? I had a stepped throttle a while but found my board very hard to ride with it.
To work well, the idea was to be hands free and with them to control the boom. To be used as a windsurfing assistant.