Posted by TonyAngel at 09:09 on 2011 Feb 22
When I used to have to travel to get to a dark sky with my LX200 my son-in-law fixed a spare battery in the boot and this was wired into the car electronics in a way that emulated a caravan socket – that is to say that when my car ignition was off it stopped charging. I had this done because once I was nearly stranded after running down the main battery!