Charging D4 - BMS considerations?

[Jpdv]

I recently came across this:


The BMS described above makes it necessary that the charger should never be connected to the negative pole of the battery when charging the battery. In this case, the BMS would not notice that the battery is being charged and would therefore assume that the initial situation was completely incorrect. This could result in error messages, poor charging behavior, or difficulties during starting.
For this reason, the negative pole should be avoided when charging the battery, and a ground point should be used instead, see picture. Alternatively, the terminal behind the BMS can be used, which is also located directly on the battery.


It got me thinking:

1. Is it correct? If so, should a CTEK comfort charger line be secured to the positive battery terminal and a body earth stud?
2. Does a traxide (or other) dual battery system need a BMS reset/adjust? Or does the isolator act to 'insulate' (no pun intended!) the BMS from the change in battery configuration?

Thoughts and comments folks?

[DiscoJeffster]

As the traxide/second battery earths to the stud, the additional battery is seen as a load on the vehicle and not part of the vehicles battery system and thus the BMS still sees its own battery as expected. I charge mine via the terminal and stud. In fact I actually charge mine through my second battery connection at the rear so it goes through the traxide.