What size is the nut on the battery? Apparently my hex ratchet is US and it's somewhere between 7/16 and 1/2. So no, I haven't made much progress other than pulling the horn fuse so I'm not "that guy" with the alarm that constantly goes off.
My incentive is to at least try the "disconnect and let sit" because the tow driver I consulted said I'd need dollys to get out of the parking garage
- i'm like three spots in from the entrance, grrrr.
PS no corrosion on the battery leads.