The battery in my T6 150PS is a 70Ah MOLL battery and I don't believe that it holds a charge as well as it ought, even for a van that's not used that much. I was going to talk with the VW service centre about it the next time that I was in there as I didn't really want to make a special trip. I also have it in the back of my mind that they will automatically blame the 'camper electrics' for putting an extra drain on the starter battery which it shouldn't and I don't believe is the case but can't prove it! As I said above, the van is not used that much and I therefore tend to leave it on a permanent trickle charge when parked. Maybe I need to leave it off charge and force the issue. That said, any work on the van, inc. potential warranty work, is now a real pain in the 4rse as my nearest van centre (Cheltenham) is closing. The next closest one is a 65 mile round trip.