Neeleman: I think the wording in the folder is incorrect and I also think you are wrong on that part. The wording is connotating the fuel gauge to the CXS and not to the battery itself. The photo you posted also suggests that it is clearly not on the battery.
If you look at all the photos NONE of them show a gauge on the battery, front side or back. The only photo that shows the gauge is on the mounting shoe on the TXS, in the LED mount. Three dots.
Same for the CXS, barely visible in the one product shot with the "facelift" CXS. The photo of the 2,6Ah battery does not show a fuel gauge and it is certainly not there in the product shots I have seen, three/four of which shows the back of the battery.
I could of course be wrong, we'll have to see. But there is no evidence in the photos to suggest otherwise.
The regular 13mm chuck is a bit unwieldy on the small CXS - I have used it, but I prefer not to. 8mm is too small but the 10mm is what the smaller chuck should have been capable of from the beginning. The new chuck is smaller and the "right size" as I see it. I have spare standard chucks but I find them to be an ill fit for the CXS.
On the other hand the small chuck has seen some action on the C12 which was nice for the small drilling tasks.