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Notebook Battery

Discussion in 'Hardware' started by Loose4Bruce, Apr 16, 2008.

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  1. Loose4Bruce

    Loose4Bruce Thread Starter

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    Does a notebook battery lose charge even when the machine is turned off?
    For example, it was at 100% when I turned it off and removed the AC adapter.
    Less than 24 hours later, I turn it on, and the battery indicator says 65%.
    I've only had the laptop for a week, and this is the second time the charge has significantly decreased while off. The first time, the battery was completely dead after being fully charged, removed, and not used for 2 days.
    Another time, I charged to full and rebooted. The battery showed 95% upon restart. I can't believe it would use that amount to power up.
    Is my battery a dud?
     
  2. dannyn

    dannyn

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    this should not happen..
    but you are shutting down the laptop not putting it in standby or hibernate... correct?
     
  3. Elvandil

    Elvandil

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    Depends what type of battery. NiMH lose about 6% per month, and NiCAD's less. Lithium loses a small percentage, too. All batteries lose power over time.

    But none should lose power at that rate and that usually means the the batteries are near the end of their lifetimes.

    Hibernate uses no power whatsoever, but sleep and standby use a small amount of power, depending on the type of standby your machine goes into.
     
  4. dannyn

    dannyn

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    how does hibernate use no power..
    even if it is the tiniest amount dosent the RAM still have to be powered.
     
  5. Loose4Bruce

    Loose4Bruce Thread Starter

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    Yes I am completely shutting down.
     
  6. Elvandil

    Elvandil

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    Hibernate saves the memory to disk (hiberfil.sys). The RAM is empty. That's why it's safer in a power failure since nothing gets lost.
     
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