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    M6Ne battery won't charge beyond 65%

    Discussion in 'Asus' started by Longwalker, Sep 22, 2006.

  1. Longwalker

    Longwalker Notebook Guru

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    Within the past week, the main battery on my 20 month old M6Ne stopped charging beyond 95%. I ran the BIOS battery calibration tool to adjust the power guage to take wear into account, but that made things far worse. After running the calibration tool, the battery stops charging at 65%.

    MobileMeter shows that the battery is only taking a charge up to 40.5W/hr even though the 'fully charged' level is, at 62.2W/hr, only slightly below the design capacity of 63.6W/hr.

    I have tried charging the battery with the system off but it has made no difference. Cleaning the battery contacts has made no difference.

    All told, it looks like something has gone badly wrong with the li-ion charger logic. Charge time has dropped to only an hour and the final pack voltage is only 4.0v per cell. It seems like the charge controller IC is terminating the charge cycle after the constant current phase (cutoff at 4.0v per cell or around 60-70% capacity) without transitioning into the constant voltage phase necessary to fully charge a li-ion battery. I have no idea how such a low-level function could break as a result of running the battery calibration tool, however.

    Is the charge controller logic in the laptop or in the battery pack? Can I fix this problem with a new battery pack or do I need to have the laptop serviced?
     
    Longwalker, Sep 22, 2006
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  2. MilestonePC.com

    MilestonePC.com Company Representative

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    When your battery is on 20 months old, you cannot expect that the status and performance still keep the same as the new one. A battery has it's own life on storge temperature and charge. More information about this:
    http://en.wikipedia.org/wiki/Lithium_ion_battery
    To get a new one see the mobilemeter is different when charging.
    Cheers
     
    MilestonePC.com, Sep 22, 2006
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