I had always used a Battery Tender on my Subaru in the wintertime, since it didn't get driven much, and many of my wintertime trips were too short to fully charge the battery. Without it, my radio would keep losing its presets when the battery voltage dropped below a certain level.
Now that I have a new Mustang, I had been planning to use a Battery Tender on it as well, though I wonder if it is necessary since the Mustang seems to have a better battery. Paul W.'s idea to wire a quick-disconnector to the front grille is a good one, and I'll probably do that.
2014 Mustang GT Premium
5.0L V8, 6-speed manual, 3.73 axle
Mods listed in profile.
Ordered 2 June 2013 | Delivered 15 August 2013.