both Akkus go to the reciever? As far as I know all "+" and "-" are connected among each other in the reciever, so two Akkus are connected parallel. I would say that in such a parallel circuit you can measure the capacity as in your drawing.
thanks Lukas and Kai.
I want to know only how much has consumed in capacity (total) and how many Ampere is consuming in real time.
Of course, with my wiring, I don't have the capacity of single battery, but the total (1 akku+2 akku)
I knew that the + and - are connected in parallel in Rex.