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Thread: Ubuntu is killing my laptop's batteriES. What to do?

  1. #1
    Join Date
    Jan 2006
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    Ubuntu is killing my laptop's batteriES. What to do?

    Hi,

    After 3 years of using Ubuntu on my laptops, I noticed that after less than 1 year the battery capacity is only 50% of what it was when I first used it.

    I use my laptop in a pretty standard way: it's connected as much as possible, with the laptop leaving the recharger every now and ten for a few hours (or a few minutes at times).

    I have a Thinkpad Edge E320.

    Now... the first odd thing is that I don't have the usual files in /proc:

    # ls /proc/acpi
    button event ibm wakeup
    #

    No battery or anything. OK...

    I found this post that seems to suggest that the best way not to kill your battery is to only start recharging when it's more than 50% drained, and stop charging at 97%:

    http://leadorg.wordpress.com/technol...-battery-life/

    I saw this thread that seems to confirm that:

    http://ubuntuforums.org/showthread.php?t=546537

    I remember reading on the Lenovo web site itself that for thinkpads their Windows driver has a special mode for laptops that are often attached to the recharger (such as mine). I cannot find it anywhere though -- sorry.

    I already have tp_smapi, and can get to the battery information through smapi:

    # /sys/devices/platform/smapi/BAT0# cat last_full_capacity
    28040
    # /sys/devices/platform/smapi/BAT0# cat design_capacity
    62160

    Gosh, worse than I thought.

    So, questions:

    * How come I don't have anything in /proc?

    * What values shall I set, in start_charge_thresh and stop_charge_thresh, in order to keep my battery from dying?

    * Is there a GUI somewhere where I can set these values and make them stick? (If not, OK no biggie

    * Is there a way to "recover" this battery so that it goes back to something acceptable?

    Any other info would be super-welcome.

    Merc.

  2. #2
    Join Date
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    Re: Ubuntu is killing my laptop's batteriES. What to do?

    Sorry, subscribing...

  3. #3
    offgridguy's Avatar
    offgridguy is offline Grande Half-n-Half Cinnamon Ubuntu
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    Re: Ubuntu is killing my laptop's batteriES. What to do?

    I haven't tried this but it looks interesting.

    http://ubuntuforums.org/showthread.php?t=1607911

    A lot of reading but maybe worth a look regarding undervolting.

    http://ubuntuforums.org/showthread.php?t=786402
    Last edited by offgridguy; February 9th, 2013 at 03:57 AM.

  4. #4
    Join Date
    Jan 2006
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    Re: Ubuntu is killing my laptop's batteriES. What to do?

    Hi,

    Alright, first answer down:

    Quote Originally Posted by mercmobily View Post
    Hi,
    * How come I don't have anything in /proc?
    Easy one: /proc/acpi/battery is now gone. The new one is sys/class/power_supply/

    The important ones, that I really feel need to get an answer to before I stick the new battery in:

    * What values shall I set, in start_charge_thresh and stop_charge_thresh, in order to keep my battery from dying?

    * Is there a way to "recover" this battery so that it goes back to something acceptable?

    Thank you,

    Merc.

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