THEMA:

Donc l'exemple sur ma photo est correct?

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Yes, this one of the options. (Just to make sure, the white wires of the JR cables won't be used / connected to the MPX plug.)

However, the wires of the JR cables on your picture are quite (or even too) thin. The wire cross section of your adapter cables should be at least the same as the JR cables of the Powerbox device. And the adapter cable length should be as short as possible.

Personally, I am not a fan of so many plugs. My preferred approach would be to cut off the JR plugs of the Powerbox device and solder the cables directly to the new female MPX plug. But this is just my personal preference ...

J'ai fais une photo rapidement comme exemple pour mieux comprendre votre information.
Je n'aime pas non plus de mettre beaucoup de fiches également pour des servos.
Souder les câbles est une bonne solution !

Merci beaucoup !

Guy

Hi is it ok to use the ex1 port to connect one of the batteries to the receiver or is there a way to change it to a servo port

AFAIK you should Not use the ex Port to Power the RX. This is also noted in the Manual.

Edit:
"The supply may be connected to the Duplex receivers via:
-the throttle channel (when applying speedcontrollers with BEC)
- a free receiver output.
- a Y-cable to any arbitrary receiver output
- the MPX connector for receivers with the EPC label which are equipped with a powersupply connector"

Regards
Nicolas