Three week storage recommendations?

Any time the ours will be sitting idle a day or two or three: I hook up a CTEK 4.3, let it run through it's cycle, and just leave it on. It's my understanding that it mostly does nothing from thereon, monitors the battery status, and gives a very occasional little tick. The issue as I see it, is that there's a very minor but inexorable background load happening, to maintain memories, power the little security blinking light, whatever. I measured it once, was a little under 20 milliamperes, constantly chewing away.

Helps that the car is garage stored (secure, out of the weather), and I've got a quick connect plug installed.

(See I'm repeating myself... )

 

What is SKS ?

 

Smart Key System.