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Thread: Newbie idiot stupid Volt/Amp question

  1. #1
    Registered User Iceman's Avatar
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    Apr 2004

    Newbie idiot stupid Volt/Amp question

    My laptop AC Adapter is 16V -- 4.5A

    If I buy a cigaret lighter type plugin that is:
    15/16/18/19/20Volt, 3,5A (max.)

    Does that mean that the battery will not charge (but the laptop will run fine)?

    Will my car battery drain if the laptop is turned off, but plugged in to the power source (power source is always on, even if the car is not running)?


  2. #2
    Confusion Master
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    Enforcer's Avatar
    Join Date
    Sep 2003
    If you go down to the woods today, You're sure of
    Although the laptop AC adapter will give upto 4.5A, it does necessarily mean the laptop needs that much (although it may well do). The chances are that the laptop will charge but may not run properly, charging does not need that much current, it make just take longer to charge fully. The main issue will be with the LCD screen and back-lite, floppy running, CD running hard-drive running, the processor running there will be enough current for all that.

    there will be battery drain, but it should be negligible

  3. #3
    FLAC DodgeCummins's Avatar
    Join Date
    Oct 2000
    DFW area
    I have tried this...and probably you will not have enough juice...especially if your car voltage drops a tiny bit. Get something that has the correct volts...and at least that many amps. You will be happier in the long run.

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