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Pismo: Li-batteries don't last long anymore - Mac Portable

My one Pismo PB's two Li-batteries last only for a short time, ie some 15 minutes. Is this the end of life for the two, or can I do something about it? This Pismo also looses time after a while when not connected to mains power, if that matters (I suspect dead internal PRAM battery). Thanks for any help, as Li-batteries are rather expensive. (If you suspect them dead, a good source at decent prices would be welcome.) Marc -- Marc Heusser - Zurich, Switzerland Coaching - Consulting - Counselling - Psychotherapy [url]http://www.heusser.com[/url] remove the obvious CHEERS and MERCIAL... from ...

  1. #1

    Default Pismo: Li-batteries don't last long anymore

    My one Pismo PB's two Li-batteries last only for a short time, ie some
    15 minutes.
    Is this the end of life for the two, or can I do something about it?
    This Pismo also looses time after a while when not connected to mains
    power, if that matters (I suspect dead internal PRAM battery).

    Thanks for any help, as Li-batteries are rather expensive.
    (If you suspect them dead, a good source at decent prices would be
    welcome.)

    Marc

    --
    Marc Heusser - Zurich, Switzerland
    Coaching - Consulting - Counselling - Psychotherapy
    [url]http://www.heusser.com[/url]
    remove the obvious CHEERS and MERCIAL... from the reply address
    to reply via e-mail
    Marc Heusser Guest

  2. #2

    Default Re: Pismo: Li-batteries don't last long anymore

    In <marc.heusser-48DA7C.04263214072003news.bluewin.ch> Marc Heusser
    wrote:
    > My one Pismo PB's two Li-batteries last only for a short time, ie some
    > 15 minutes.
    Recent discussions on MacFixit suggest resetting nvram in open firmware
    might help. m.

    --
    matt neuburg, phd = [email]matttidbits.com[/email], [url]http://www.tidbits.com/matt[/url]
    REALbasic: The Definitive Guide! 2nd edition!
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    matt neuburg Guest

  3. #3

    Default Re: Pismo: Li-batteries don't last long anymore

    In article <marc.heusser-48DA7C.04263214072003news.bluewin.ch>,
    Marc Heusser <marc.heusserCHEERSheusser.comMERCIALSPAMMERS.inv alid>
    wrote:
    > My one Pismo PB's two Li-batteries last only for a short time, ie some
    > 15 minutes.
    > Is this the end of life for the two, or can I do something about it?
    > This Pismo also looses time after a while when not connected to mains
    > power, if that matters (I suspect dead internal PRAM battery).
    How old are the batteries? What sort of use have they had? LI-chemistry
    batteries are typically rated for 500-1000 charge-discharge cycles.
    Shelf-life for unused batteries is typically around 2 years. If your
    batteries are older than that, or have been used since you have bought
    your machine, they are almost certainly at EOL. Of course, if your
    batteries are new, or if some other cirstance is suspicious,
    something might be up. Isthere something suspicious about this capacity
    loss?

    My experience was that my old battery gradually lost capacity until I
    was getting about 1 hour of working time. I haven't pushed that battery
    much, so don't know how quickly the capacity will fall off from here.
    >
    > Thanks for any help, as Li-batteries are rather expensive.
    > (If you suspect them dead, a good source at decent prices would be
    > welcome.)
    >
    I recently purchased a new battery for my Pismo from CDW.com. Fast, good
    service, low price.
    > Marc
    --
    later.

    johajohn AT indianahoosiers DOT edu

    Remove the adjective to reply. Indiana is a noun.
    John Johnson Guest

  4. #4

    Default Re: Pismo: Li-batteries don't last long anymore

    In article <read_the_sig-54E72D.09070314072003news.indiana.edu>,
    John Johnson <read_the_sigthe_bottom.edu> wrote:
    >My experience was that my old battery gradually lost capacity until I
    >was getting about 1 hour of working time.
    I've got one right here which has about 30 minutes. I'd get a new
    one but I'm going to replace the entire Pismo as soon as a new 15"
    PowerBook comes out.

    Yes, the LI batteries have a limit of 2000-ish discharges or
    2.5-ish years, whichever comes first. After that their
    capacity goes downhill very quickly.


    Simon Slavin Guest

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