my Nav VI battery is from 2018. Now that not in production, very hard to find. But, Sierra had it and got it to me promptly after order. Product is exactly as described and Sierra is the best!
I recently purchased a spare Touratech skid plate for my 2011 R1200 GSA from Sierra BMW. I swear by the current one. It is amazing after 200,000 miles, many off-road including LA-Barstow-Vegas, five GS Trophy qualifiers and numerous dual sport events. Mine is bent and scarred but still fits and works great. Sierra BMW also offers the best prices on Touratech items that I’ve found.