Originally Posted by
MikeBz
VW service centre had the car for 90 minutes and say they checked everything out - all OK except the battery which has been replaced under warranty. Drove for about an hour afterwards and put the meter on the battery - just under 12.6V with and without the engine running. So that leaves me still suspicious of the charging system, but I note many threads on other forums which talk about the charging system aiming to keep the battery SoC between 50 and 80% charged to save fuel (by not charging it to 100%). It might save a few drops of fuel but it will shorten the battery life - this isn't progress... Lots of reports of premature EFB battery failures in VAG cars on other forums.