Yes set the target or end voltage to 4.2v/cell if a regular LiPo. If its a LiHV, you can set if for 4.35v/cell. I know a couple racers who overcharge their LiPos to 4.44v/cell, idk why, mostly because if the voltage drop or rest after a charge. But just put 4.2 to make it best for the health and...
I'm pretty sure yes, the balance cable is for reading both / all cells voltages and balancing them out. The current goes through the main + and - wires. If you only plug in the main + and - wires, you would only get total voltage of the battery.
If your battery has the GTec smart system, you...
Yes, It should balance out when you start using it. Always balance charge too.
I had a few Hoovo 2s batteries that did that on me. With my charger, I couldn't get them to actually balance so one cell is .2v below than the other. And thats why I decided to get rid of it.
The discharges in the actual chargers don't fully.discharge, they discharge to about 3v per cell before they stop. Yes running it in the car could work, only if you turn off low voltage detection.
My go to would either be a light bulb, or salt bath. Ooooor at your own risk and in an outside...