I just modified my car to use dual batteries. I did it before when I had a swapped PCB and things stopped working after a while. I am charging the batteries with a peak charger.
Here is the strange stuff... The battery voltage of the pack is at about 2.5 volts. Once I connect the ground wire from the PCB the voltage immediately drops to about 1.5 volts and the PCB get a little warm.
Right now the PCB does not respond to controller input. I read where it could be the ground wire touching the heat sink so I am checking that out, but I don't think that is it.
Any other ideas? What could I be doing to the PCB? The same thing happened to the clone PCB that I had in the ZZ.