Thank you for your response. The diffusion to the battery is what I am scared of. Doesn't it reduce the lifetime of the battery (that's why I asked for the thermal insulation)? I'm just curious how they manage, that the battery never reaches the 140*F they have written on it. Maybe we'll see when someone makes a heatmap of the device ;).
I am curious about the copper plate over the battery. Is there some insulation against heat radiation to the battery? Does the plate radiate against the lcd (the battery also tells that the temperatures should not be higher then 140°F. Thinking about how they manage this)?