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Does cigarette lighter adaptor drain car battery overnight?

Discussion in 'Automotive' started by Bill Latshaw, Dec 26, 2018.

  1. Bill Latshaw

    Bill Latshaw Lurker
    Thread Starter

    Hi.
    I bought a car cigarette lighter splitter to plug in 2 devices. With it plugged in, with no devices attached, will it drain the car battery. The only thing on, is a tiny red LED on the splitter.
    Thanks for your help.
    Bill NJ
     


  2. lunatic59

    lunatic59 Moderati ergo sum
    Moderator

    It's politically incorrect to call them "cigarette lighters" ... now they are "accessory ports". ;) :rolleyes:

    If the light's lit, then there is a drain on the battery. But, that little LED is using only a fraction of a watt and with nothing else plugged in, there should be no additional drain. I leave mine in all the time, but I use the port in my car that disconnects power when the ignition is off.
     
    PitCarver and Mikestony like this.
  3. It depends on the vehicle. In most late-model cars the power outlet(s) in the dash/console are ignition-switched and will not operate unless the key is in either the run or accessory position. You can check the owners manual for your particular car to see how the outlet behaves.
    Some newer cars will have a "retained power" system where the accessory circuits will remain active for a set period of time after turning the ignition off, maybe 30-60 minutes or until the car is locked. Again check your manual.
    As for the potential drain with the adapter connected, I agree it wouldn't be that much but I'd still unplug it if in fact the circuit does remain active. There is already a small parasitic drain from all the electronics in the vehicle, no need to add to it.
     
    PitCarver likes this.
  4. svim

    svim Extreme Android User

    A typical car battery has a relatively huge storage capacity so something like a little LED indicator light is drawing an insignificant amount of power. The amount of power it's using is pretty much the same as what is being used to save your radio station pre-sets.
    Just some typical numbers to gauge things by;
    -- a typical 3mm LED, like the one that's commonly in devices like you have, uses about 17mA
    -- a basic (lower end) car battery will have at least 45Ah capacity, or for comparison 45,000mAh,
    So don't worry about it.
     
    lunatic59 likes this.
  5. lvt

    lvt Android Expert

    Like others said, no problem, the battery is big enough to power the anti-theft system for weeks.

    And cars usually cut off the power to the cigar lighter port when you remove the ignition key.
     
    dontpanicbobby likes this.
  6. dontpanicbobby

    dontpanicbobby 100% That Guy
    VIP Member

    No. But of you're worried take it out when you get home. Can't drain if it's not connected.
     
  7. LANS12

    LANS12 Lurker

    Like what others have said your completely fine having it attached. I tend to leave mines from time to time on the port as well
     
  8. Bill Latshaw

    Bill Latshaw Lurker
    Thread Starter

    Solved, thanks everyone
    Bill NJ
     
    lunatic59 and dontpanicbobby like this.
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