This is what I'd do. I would charge it before binning it regardless.Can't you swap the battery with the Passat just to confirm it?
This is what I'd do. I would charge it before binning it regardless.Can't you swap the battery with the Passat just to confirm it?
Sounds like you're sorted now so this advice is pretty much redundant...
There isn't an issue with disconnecting the jump leads whilst the cars are running, there's just a certain order you need to do it in. It should say in the manual (iirc it's the reverse order to the order in which they should have been connected).