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Thread: Regarding use of laptop batteries in Car PCs

  1. #1
    Newbie RedScorpion's Avatar
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    Regarding use of laptop batteries in Car PCs

    I wrecked my Car PC

    But I am using this as an excuse to upgrade to a asus Eee 1000 =)

    I have been suffering from not being able to tune to any FM station because of power supply interferences while I was using M3-ATX, and now I guess I will just use the in car original ASUS adapter, I really think this will solve my problems once and for all!!!


    My plan here is to use the laptop with its included battery in 2 situations

    1. Ignition on ======> power to the laptop jack (Carputer always on)
    2. Ignition off ======> Laptop on battery power (will hibernate when Idle for X amount of time)

    My question here is, is it safe to keep a laptop battery in the car hooked up to a laptop even if not being used as long as ignition is on?

    If everything was hooked up right, is there a risk of overheating the batteries and causing damage?

    I will put some powerful fans in there for cooling.

    Another important question, does anyone know where can I draw power from laptop to control relays for LCD etc when laptop is on?

    (all USB ports are always powering in this type of laptops which sucks aggghhh)

  2. #2
    The Last Good Gremlin GizmoQ's Avatar
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    Quote Originally Posted by RedScorpion View Post
    My plan here is to use the laptop with its included battery in 2 situations

    1. Ignition on ======> power to the laptop jack (Carputer always on)
    2. Ignition off ======> Laptop on battery power (will hibernate when Idle for X amount of time)

    My question here is, is it safe to keep a laptop battery in the car hooked up to a laptop even if not being used as long as ignition is on?
    YES, but why ignore the possibilities available because you have the extra battery:
    I set up my tablets so the screen goes off 1 minute after switching from AC to the battery so if I have to make a quick run into the store or get gas its still on. My tablets run RR and the powermon plugin so as soon as the tablet switches from AC to the battery whatever is playing is paused/muted until AC is returned and then it unpauses/unmutes (instant on right where I left off). My battery's good for 4 hours so I have my power setting set to dim the screen 1 minute after AC power loss, 1 or 2 hours later (I change it whenever the need arises) go to standby, and when the battery gets to 10% remaining it powers back up and hibernates (usually 6-8 hours). The battery gives you additioal options - you might as well take advantage of it.

    Quote Originally Posted by RedScorpion View Post
    If everything was hooked up right, is there a risk of overheating the batteries and causing damage?
    NO, I leave my tablets on my dash for hours in the sun. I know its too much when the screen gets so warm the pixels wont light up, but as son as it cools down, it always works as it should and its never hurt the life of the screen, batteries, or motherboard.

    Quote Originally Posted by RedScorpion View Post
    Another important question, does anyone know where can I draw power from laptop to control relays for LCD etc when laptop is on?
    (all USB ports are always powering in this type of laptops which sucks aggghhh)[/QUOTE]

    ????? This one confuses me. If the USBs are always on, won't a Fusion Brain also always be on and you can use it to control relays powered by the car battery???
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  3. #3
    Newbie RedScorpion's Avatar
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    Quote Originally Posted by GizmoQ View Post
    YES, but why ignore the possibilities available because you have the extra battery:
    I set up my tablets so the screen goes off 1 minute after switching from AC to the battery so if I have to make a quick run into the store or get gas its still on. My tablets run RR and the powermon plugin so as soon as the tablet switches from AC to the battery whatever is playing is paused/muted until AC is returned and then it unpauses/unmutes (instant on right where I left off). My battery's good for 4 hours so I have my power setting set to dim the screen 1 minute after AC power loss, 1 or 2 hours later (I change it whenever the need arises) go to standby, and when the battery gets to 10% remaining it powers back up and hibernates (usually 6-8 hours). The battery gives you additioal options - you might as well take advantage of it.



    NO, I leave my tablets on my dash for hours in the sun. I know its too much when the screen gets so warm the pixels wont light up, but as son as it cools down, it always works as it should and its never hurt the life of the screen, batteries, or motherboard.


    (all USB ports are always powering in this type of laptops which sucks aggghhh)
    ????? This one confuses me. If the USBs are always on, won't a Fusion Brain also always be on and you can use it to control relays powered by the car battery???[/QUOTE]


    Interesting use of tablet as a carputer, You answered my questions about safety of laptop batteries in a car.

    I don't have fusion brain, in my old setup I was using the output of M3-ATX to power relays hooked up to the LCD and HD radio.

    There is this feature in those netbooks called "sleep on charge" when laptop is hooked to AC adapter, average users think it is cool, I think it sucks so bad especially that Asus doesn't offer any option to disable it in the Bios. That means I cannot use the USB output power to control LCD and HD radio.

    Therefor I will have to start the laptop on its battery and then a relay will switch laptop adapter on to continue without batteries.

    I will have to find another source... I am thinking maybe the CPU fan wiring could do it??

  4. #4
    Raw Wave
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    Am I confused because I'm missing the obvious?

    As I read it, you are merely powering the laptop from ignition power.
    Otherwise it runs on its own battery (as per normal operation).
    This is no different to running off mains (wall sockets) etc.

    Are the USBs powered when the laptop is off?
    If not, the USBs can switch the LCD when the laptop is on.

    (Note my lack of assumptions, including cabin temperatures.)

  5. #5
    Newbie RedScorpion's Avatar
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    Quote Originally Posted by OldSpark View Post
    Am I confused because I'm missing the obvious?

    As I read it, you are merely powering the laptop from ignition power.
    Otherwise it runs on its own battery (as per normal operation).
    This is no different to running off mains (wall sockets) etc.

    Are the USBs powered when the laptop is off?
    If not, the USBs can switch the LCD when the laptop is on.

    (Note my lack of assumptions, including cabin temperatures.)
    I guess this explains it better.

    USBs stay on as long as adapter is hooked to laptop whether battery is charging or not, Asus wanted to allow users to charge their other applications with USB ports regardless of laptop operation.

    I will relay on laptop operation in controlling my LCD and HD radio, with this stupid feature there is no way I can use USB, therefor I will have to search the mobo for any other source of juice to power a controlling relay. That same relay will connect laptop to the adapter.

    It will go like this:

    Laptop disconnected from adapter (normal ignition off state)

    When powering laptop, relay will hook adapter to laptop and laptop will not need battery power, same relay but other contacts will power on LCD and HD radio.

    The only role Ignition will play here is allowing adapter to be hooked to the relay that powers laptop, also powering LCD in case I only wanted to use rearview camera.

    I just found out that fan has a line that give 5v, this could be the solution.

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