As the title states, my car won't start after sitting overnight in cold weather (below freezing).
If the weather stays relatively warm (above 35 degrees) it will start fine after sitting overnight.
If I jump it, it starts right up no matter what.
I sometimes leave my radar detector on overnight, and I realize that probably exacerbates the problem, but this was never an issue before it started getting cold out. I could leave the radar detector on for a few days without any problem...
Any ideas as to what I should do (aside from just removing the radar detector)? You think it is a sign of a bad battery? Is it just the cold weather + radar detector depleting the battery overnight?