From what I understand it will not be available and was only included with the initial units sent.
I purchased one of these early unity used and had frustrating intermittent power connectivity issues allowing the bot to only 2 minutes of run time before loosing connectivity and shutting down.
Vincross tech support said that the charging pad created excessive heat through induction and affected the solder joints. The repair time and instructions require the bot to be taken completely apart. I returned the used HEXA and bought a new one in late 2020. They no longer include a charging disc.