@barajabali Benjamin Vedder doesn’t make VESC only to work with SPACE Cell, so you could use Li ion / Lifepo4 / lipo packs / what ever batteries as long as it could supply the power your motor needs.
You will have to check VESC site by Benjamin to check the voltage limit as I didn’t remember them by heart.
VESC has a port for hall sensor, but again most of builders here use VESC because of it’s low speed non cogging ability. I didn’t mean to recommend you to buy small / cheaper ESC, but this is one of the best feature of VESC. I believe you could combine sensored and sensorless mode with the BLDC tool provided. I would recommend to just connect them and test what works best for you.
2 Best place you could get VESC:
@onloop - Enertionboard
@chaka - Ollinboard
At least those are the suppliers I would recommend