cf-19 battery goes flat

Discussion in 'Panasonic' started by tazmadman, Sep 21, 2016.

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  1. tazmadman

    tazmadman Newbie

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    my cf-19 mk3 battery goes flat when the laptop is turned off the battery seems fine as it works on battery fine
    im running win 10 and im at a loss as to why
    it has gps and the plastic litup keyboard
     
  2. Shawn

    Shawn Crackpot Search Ninja and Options Whore

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    Fully charge the battery and pull it out of the CF 19.
    Let is set for a day or two (A week would be better) and then re install it and see of it has lost some charge.
    If it loses charge while outside the laptop, then the battery is failing.

    BTW: A GPS will always draw power even when the CF 19 is off.
     
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  3. toughasnails

    toughasnails Toughbook Moderator Moderator

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    Welcome to the Panasonic Toughbook forum

    Yes it will die over time , 3 to 4 weeks I find. If you are not going to use it for a while I would pull the battery. That's what I do.

    Edit: Shawn beat me to it
     
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  4. BaRRmaley

    BaRRmaley Notebook Deity

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    It's impossible.
     
  5. toughasnails

    toughasnails Toughbook Moderator Moderator

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    It sure is possible. This has been talked about in many threads over the years.
     
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  6. tazmadman

    tazmadman Newbie

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    thanks guys the problem is the battery will go flat over night thats whats odd and yes i know the gps does draw current in standby its strange because i get about 4hrs battery time on a charge
     
  7. CWB32

    CWB32 Need parts for my flying saucer.

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    yeppers ...
    my '19 battery will go flat after a couple of weeks (or longer) .
    the most recent event took place over the last two weeks and involved a busy schedule and forgetting to pull the battery .
    i fired up the '19 and it showed about 1/4 charge ... this is due to "self-discharge" and the switchmode based "keep-alive" circuit .
    the keep-alive circuit is to allow warm-starting the gps module as well as a couple of other functions .
    i dunno ... i feel that the design should have included a way to turn off this function in the bios and thus preserve/extend the off mode battery life .

    the self-discharge of the battery can and will far exceed that of the "standby" drain .
    brand new batteries do not suffer nearly as much from this as do batteries that are long-in-the-tooth .
    couple this with the reduced capacity of *older* or cycled-to-death batteries and the effect becomes more and more noticeable .
     
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  8. tazmadman

    tazmadman Newbie

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    well i think i have worked out what was wrong i have a USB 3.0 Express card fitted and it seems it draws power when it is turned off :( i tested it last night with out the card and the battery was full thismorning
     
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  9. Shawn

    Shawn Crackpot Search Ninja and Options Whore

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    All those usb expresscards do that.
    Glad you figured it out and THANKS for posting the solution.
     
    tazmadman likes this.
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