ECP/CP4L dont sell Varta.
I have spent a little time trying to fathom out the Varta date code system, but none the wiser so far...
I would recommend taking just a little moretime, to remove the battery box and tray completely, so that you can clean all the crud away that was collected underneath, if yours is like mine. Also washed down to neutralise any stray acid.
Easy 3 x 10mm bolts.
I then waxoyled that area just in case...