12v power outlet always on fix?

i use the 12v power outlet for phone charger, sirius radio, etc, and i always forget to unplug after turning off car. the last thing i need is to come back to a dead battery. the 12v power outlets always stay on...is there a fix for this?? i guess i could hardwire sirius, not exactly what i want to do, but if i have to...

any ideas??????

I leave my phone plugged in all night long, every day. I used to keep my XM running 24-7 until I hardwired it in. Neither one draw enough to drain your battery unless you're talking about a week or more.