Shit VW !!
I've got a shitty VW Golf - about 5 years old - that eats batteries!!
Fault at the moment is that, despite the battery is good enough to light the headlamps, just turn the ignition key and bugger all happens, just a "click noise from somewhere around the dashboard.
If one sit there for a bit (an extendable time) & tries again [several times] the fucking VW will decide that I've waited looong enough, and then starts the engine - till the next time.
The useless official VW service station in HK fails to find the problem!