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    How to discharge laptop battery below 3%?

    Discussion in 'Windows OS and Software' started by jackluo923, Jul 18, 2009.

  1. jackluo923

    jackluo923 Notebook Virtuoso

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    I want to run the laptop until the battery itself cutoff. How do I change the "critical battery level" action to "do nothing"?
     
    jackluo923, Jul 18, 2009
    #1
  2. MDR8850

    MDR8850 Notebook Evangelist

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    power options at control panel
     
    MDR8850, Jul 18, 2009
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  3. jackluo923

    jackluo923 Notebook Virtuoso

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    If you change it at the power options in control pannel, it'll tell you the minimum % of critical power level is 2%. There is no "do nothing" option for critical battery level action. There's only shutdown/hibernate/sleep.

    Anyways.. I'm still looking for an option. Right now.. I have to trick the OS to discharge below 3%.
    1) Let it sleep at 3%
    2) Plug in power
    3) Unplug power during Boot
    4) continue using the battery to/after 0%.

    The battery lasted 1 hour before it cuts off. Now I gained ~10000mW of battery capacity. Yay.
     
    jackluo923, Jul 18, 2009
    #3
  4. Shyster1

    Shyster1 Notebook Nobel Laureate

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    Time for a refresher course at Battery University - over discharging a lithium-ion battery (that is, running it down too far) can cause serious damage to the battery and should not be done, as this Battery University Do's & Don't's Chart indicates.
     
    Shyster1, Jul 18, 2009
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  5. jackluo923

    jackluo923 Notebook Virtuoso

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    I know...
    When the circuits in the battery prevents from discharging the battery too much. That's why when I ran the laptop at 0% battery, it continued running for an hour until the battery's circuits cuts the current and protects the battery from over-discharging. Thus there's no serious damage done to the battery by discharging to 0%.

    When I discharge and charge many times.. the battery meter becomes increasingly inaccurate. The only way to fix it is to run the battery until the battery stop feeding the laptop current. The battery meter will reset and the accurateness of the battery meter is restored.
     
    jackluo923, Jul 19, 2009
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  6. HTWingNut

    HTWingNut Potato

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    enter the BIOS and just let the battery die?
     
    HTWingNut, Jul 19, 2009
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  7. MaXimus

    MaXimus Notebook Deity

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    WOW! Very good idea! will do that right away :)
     
    MaXimus, Jul 19, 2009
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  8. goofball

    goofball Notebook Deity

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    in a command prompt window

    powercfg -setdcvalueindex SCHEME_CURRENT SUB_BATTERY BATACTIONCRIT 0
     
    goofball, Jul 19, 2009
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  9. Mastershroom

    Mastershroom wat

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    As wingnut said, try running it down in the BIOS, or try a different operating system, like a Linux distro, maybe a LiveCD.
     
    Mastershroom, Jul 19, 2009
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  10. Rodster

    Rodster Merica

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    LOL at Wingnut's Avy. :D
     
    Rodster, Jul 19, 2009
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