The power connector for the Floatwheel is a DC5.5/2.5 plug and the stock hypercharger rated to 10A of charging.
The charger must be plugged into the wall before being plugged into the board. To avoid potential charge plug spark turn your board on first if possible.
When charged to full the BMS will balance all cell groups down to 4.14v (~90% capacity) over the course of ~5 hours.
The Floatwheel has a large passive discharge among similar VESC boards.
This discharge comes in at ~.7v per day or ~8mAh/hour according to Tony
Tony did note that once cells reach 2.7 power to the mosfet is cutoff preventing any further discharge. This is the reason for some boards being unable to be powered on as they arrived and needing some charging first before powering on.