Re: Laptops / Games / Fedora & battery life

From: M.Hockings (veeshooter_at_hockings.net)
Date: 02/09/04

  • Next message: Bill Nottingham: "Re: Fedora Core release 1.90 (FC2 Test 1) questions" 
    To: fedora-list@redhat.com
Date: Mon, 09 Feb 2004 11:52:51 -0500

    > On Sun, 8 Feb 2004,
    >M.Hockings wrote:
    >
    >
    >
    >>I think that most modern laptop batteries are "smart", that is they have
    >>a chip that tries to keep track of the battery's available power. If
    >>you don't completely discharge the things once in a while they kinda
    >>forget about the rest of the battery. Going from memory I think the way
    >>to recover some of the lost capacity is as follows. Power off the
    >>machine, then power it back on to the power on password or hold it in
    >>the bios setup or whatever until the battery completely dies. Then plug
    >>it in and let it completely charge. That should help calibrate the
    >>chip. I seem to recall reading in the specs for one laptop about how
    >>long the battery would last when new and how long when 1 year old. It
    >>was diminished by a significant amount.
    >>
    >>Mike
    >>
    >>
    > Joel Jaeggli wrote:
    >
    >Batteries wear out. discharging lithium-ion or polymer batteries to the
    >end of their usable charge is a good way to damage them faster...
    >
    >to quote some motorola engineers:
    >
    >The relationship between DOD (depth of discharge) and cycle life is
    >logarithmic. In other words, the number of cycles yielded by a battery
    >goes up exponentially the lower the DOD. Research studies have shown that
    >the typical cellular phone user depletes their battery about 25 to 30
    >percent before recharging. Testing has shown that at this low level of
    >DOD a lithium-ion battery can expect between 5 and 6 times the cycle
    >numbers of a battery discharged to the one hundred percent DOD level
    >continuously.
    >
    >http://www.motorola.com/ies/ESG/testlab/article1.htm
    >

    I did not say to do it continuously, just as a way to reset the battery
    chip.

    I believe that the recommendation with IBM Thinkpads is to do it monthly
    though I can't find the doc right at the moment.

    Mike 

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