Replaced the cigarette lighter today with a set of USBs led is always lit, even when the ignition is off/no keys.
1. Is the cigarette circuit always powered? 2. Will the led cause noticeable battery drain?
Old lighter, Back in Black playing on Millennium Falcon, coffee, what else do you need?

Center console out

Rear console out, testing new USB ports. Works fine to charge my Samsung Galaxy Note 5

Better view of USBs installed in console

[This message has been edited by FStorm (edited 06-05-2016).]

Yes, it is always on. It's powered from the BAT fuse.

LED(s) isn't only issue. USB w/o anything in it can use power too.

If you drive every day may not drain battery too much.
Depending on battery, exact power used by ECM Radio and your new toy, Park for weekend or a week then you might have problems.

Best to use a source that's on w/ key in ACC and ON.
Fuse box have plugs that do just what is needed.

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Dr. Ian Malcolm: Yeah, but your scientists were so preoccupied with whether or not they could, they didn't stop to think if they should.
(Jurassic Park)

The Ogre's Fiero Cave

I frequently leave my USB charger with LEDs active plugged in to the cigarette lighter for days without the car running. It won't kill a good battery for maybe a week as Ogre said. Of course all the other stuff in the car *will* kill a battery in about a month depending on the shape of the battery, alternator, electronics. You will have the ECM, the radio, and perhaps a couple of other loads drawing a few milliamps 24/7. An old battery won't last a week in Texas heat.

I just wired a switch on mine. I turn the switch off and no power to the lighter socket...

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-Brian

My 87 GT Poly Suspension Upgrade (all pics) thread
Removing the roof panel
My HUD install thread
Modified stock air canister and base to 3.5 inch for 3800na