Replaced battery per Golfdave's outstanding article on using increased battery size.
http://www.golfmk7.com/forums/showthread.php?t=7926
Battery was still fine after 3 years and a few months, but I got tired of having to throw a charger on it now and again, and aware of VW using an undersized capacity it has for its work load.
For US, I used a size 48 or H6. Costco carries in Interstate in group size 29. Purchased proper size battery blanket and replaced.
Adaptations changed in Can Gateway module 19 to let brains of car know I changed car battery (adapt new battery charging profile) was update serial number (used date), wet vice Fleece (it’s a Varta thing), and capacity to 70Ah.
That’s not a battery, this is a battery!