So far, I've only towed the car 10 miles from the installer to my house, so not much experience with it yet. I'll have more information after we leave for Arizona in January. What was done was to install a Battery Brain Gold or Deluxe version on the positive lead to the underhood fuse box. Then a lead was taken from there to supply a new 12V outlet to power the Brake Buddy. I do like the remote disconnect operation. It also has a manual backup for the disconnect in case the remote doesn't work. Also, I don't lose radio presets or anything else noticable so far, except to have to reset the clock. That kind of surprised me, I thought I'd lose the presets.
If this thing works as advertised, it would also solve your problem of a dead battery if something is inadvertently left on during normal day to day operation. It's supposed to monitor battery charge condition, and automatically disconnect if the battery is being discharged too low, and allow you to reconnect and restart it later. I haven't tried that option yet