Hello,

this is my first time writing a post on this forum so please forgive me if I am posting in the wrong place.

I’m in the process of trying to put in a lithium extra battery for my defender 2022. I have seen there is a space in the bottom left where many people have posted where they store the battery. In my model there seems to be two black boxes stacked one on top of the other. In other posts I have only seen one of this box. I am not entirely sure what it does. Does anyone know what this is?

Thanks
Shahi