As for battery connectors in fake-battery - isn't it just 100kOhm resistor between BMI pin and ground? The 2nd element - between ground pin and actual ground - isn't resistor for sure - it's either diode, or fuse, or something else, but not resistor (hard to tell from photo). /Estel
As far as I can see it I would have to connect the minus-cable from the charger (I really do hope it is colorcoded aswell) to the minus-part of the box-cable, do the same for the plus-part and connect gnd and gnd?