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Thread: asus eeepc x101 owners cat /proc/acpi/battery/BAT0

  1. #1
    Join Date
    Dec 2011

    asus eeepc x101 owners cat /proc/acpi/battery/BAT0

    Hopefully not at the wrong place I m looking for some informations about laptop battery of an asus x101 model e.g. a31-x101. that is a 3 cell one.

    Mine has given up recently just 30 minutes left after 9 months powerusing
    The prices for this type of batt ranges from ~40 - 90 Eur. Thats a lot I thougt
    so why not hacking the batt.
    I checked cat /proc/acpi/battery/BAT0/info and saw just some 800 mA last full capacity.
    So I decided to open the plastic and check the malicious cell. It was a hard work to open the case and keep the batt working. Then I connected a cell-logger with some soldering and found the middle cell more than 400mV difference to the right one. Without load!.
    The cell-logger told me the laptop-charging algorithm is not balancing the cells.
    So i connected the removed batt to a separate lipo balancer charger.
    Still all cells left soldered in the case a retry after balancing told 1670mA last full capacity that was feeled too optimistic due to just some minutes more now without adapter.

    Finaly I changed the cells with some i know are good . And bricked the batt. (

    So far still some information is present but no supply, and no charging.
    The voltage reading is exactly the one the cell-logger reports.
    But the serial number is missing now, and the cycles is set to 0

    The net told me lots of stuff about the batt controllers possibilities, but so far i have no idea which one is really inside nor how to make the reset.

    May someone post a working batterys info or more if you can generate somehow.

    My goal would be to bring the "repaired" batt back to life and then donate half the price of a new batt bucks to a human organization.

    here what is left

    >cat /proc/acpi/battery/BAT0/info
    present: yes
    design capacity: 2600 mAh
    last full capacity: 1670 mAh
    battery technology: rechargeable
    design voltage: 10800 mV
    design capacity warning: 10 mAh
    design capacity low: 5 mAh
    cycle count: 0
    capacity granularity 1: 26 mAh
    capacity granularity 2: 26 mAh
    model number: X101
    serial number:
    battery type: LION
    OEM info: ASUS

    >cat /proc/acpi/battery/BAT0/state
    present: yes
    capacity state: ok
    charging state: charging
    present rate: 0 mA
    remaining capacity: 1571 mAh
    present voltage: 12192 mV

    >acpi -b
    Battery 0: Charging, 94%, charging at zero rate - will never fully charge.

    tools used and opened cellpack

    Cell-logger attached shows number 2 has a low voltage

    Here the batt is discharging with the logger attached

    Finally this is what is left by now, nice view no charging no discharging in the netbook

    Last edited by 0800peter; January 23rd, 2013 at 07:26 PM. Reason: img attach


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