It will not damage anything, but there are some things to be aware of. On a lot of newer cars like yours, the engineers cleverly designed in a lot of tricks to force you to go back to the dealership. VW in particular has multiple computers that lock up simply from disconnecting the battery to replace it. The transmission won't come out of "park", and if the engine starts, it won't rise above idle speed. You have to drag them off the hoist and onto a flatbed truck for a trip to the dealership to have the computers unlocked. To add to the misery, for liability reasons, almost every repair procedure you can think of starts with, "disconnect the battery".
GM used to be famous for this too with their radios locking up. Now that is also common on almost all import vehicles. There are a number of cars that we have been warned about where this is NOT a problem, but it is something you want to consider.
Also be aware that a battery that is allowed to remain discharged will start to sulfate. Hard lead sulfate will build up on the plates. That will prevent the flow of current through those plates, and you may never be able to bring the battery back to where it can reliably crank the engine. A better alternative is to connect a small float charger or a small solar panel battery maintainer. If you don't want to do that, disconnect the battery's negative cable to prevent the many computer memory circuits from discharging the battery. The industry standard, unless specified otherwise, is those computers can be allowed to draw a maximum of 35 milliamps, (.035 amps). At that rate, a good battery will be able to crank the engine fast enough to start after sitting for three weeks.
Saturday, January 17th, 2015 AT 12:32 AM