If you're interested in reading the manuals for the GT and GTL, check out these (available on the BMW Motorrad Canada website):
http://www.bmw-motorrad.ca/pdfs/riders/K1600GT.pdf
http://www.bmw-motorrad.ca/pdfs/riders/K1600GTL.pdf
Interestingly, they're actually using some fuses in these bikes, and a gel battery.