One throttle wiring two controllers on two batteries

[tonylai]

As the title mentions, I'm using one throttle wiring two independent controllers with two batteries, and the batteries are not common ground.
I've seen some videos that use one throttle wiring two independent controllers but with one battery.
So the wiring of the throttle goes 5V GND SIGNAL to controller1 and SIGNAL to controller2.

But how about two batteries?
How should the throttle wired?

(5V,GND,SIGNAL) (5V,GND,SIGNAL)
Battery1-------Controller1--------------------throttle--------------------Controller2-------Battery2

OR

(5V,GND,SIGNAL) (SIGNAL)
Battery1-------Controller1--------------------throttle--------------------Controller2-------Battery2

OR

(5V,GND,SIGNAL) (GND,SIGNAL)
Battery1-------Controller1--------------------throttle--------------------Controller2-------Battery2

Thanks for your reply!!

 

[vfr400]

You can't use one throttle with two cotrollers without making the grounds of the batteries common, otherwise you'll get random glitching and other problems, which is dangerous.

You wire the throttle to one controller as normal, then splice a second wire onto the signal wire and run that to the second controller, leaving the red and black disconnected on that one.

 

[tonylai]

Which one will be better?
To parallel the two batteries or just make the ground of the batteries common?

 

[vfr400]

You can't charge batteries when they're in parallel because one will charge the other through the discharge wires, which by-passes the charge controls. There are ways round that, but probably easier and safer to keep the batteries separate, but with common grounds unless you need to squeeze out the maximum range.

 

[tonylai]

Thank you sooooo much