I did leave my lights on, I must admit.

I tried this external unit to give the battery a boost, but nothing...

The odd thing is (I think) is that the radio and hazard lights work, but
the cigarette lighter gives no charge to my cell phone charger, and the
key doesn't make a sound when turned on - nor do the lights come on in
the dash.

I have a second battery in the back which  runs stuff from a converter,
but I don't think it's connected to this other stuff.

I tried changing the fuses to see if I could get the cigarette lighter to
come on but nothing happened.

Don't have a voltmeter handy - just wondering if this problem is at the
key or the battery? Seems like I should hear that annoying buzz when the
key is in the ignition and the door is open (at least)

Thanks,

Andree