charge battery to 80% only

Discussion in 'Hardware Components and Aftermarket Upgrades' started by Tinderbox (UK), Sep 13, 2009.

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  1. Tinderbox (UK)

    Tinderbox (UK) Sir Pumpkin Longshanks

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    Does you notebook have the option to charge to 80% , basically a battery saver , but how much longer will the battery live for.

    I asked this question on a forum , that specialist in li-ion battery`s , and got a interesting answer.

    If you only charge to 80% , you "might" get up to 2000 cycles

    But at 100% charge you only get around 500 cycles.

    I think you should look at 750-1000 cycles if you charge to 80% , which is worth the 20% loss in runtime for my needs.

    I am not certain how accurate these number are but they are interesting.

    A link to the forum were i asked the question is below.

    http://www.candlepowerforums.com/vb/showthread.php?t=241995
     
  2. moral hazard

    moral hazard Notebook Nobel Laureate

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    it make sence because your charge cycle is less when you charge to 80% than if you charged to 100%.

    What I'm saying is that if your have shorter charge cycles, you will more of them before the battery dies.

    But you are actually getting about the same value out of the battery.
     
  3. Phil

    Phil Retired

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    I don't believe that's right. Lenovo and Sony offer the option of charging to 80% because it does help prolonging battery life.
     
  4. DetlevCM

    DetlevCM Notebook Nobel Laureate

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    Well, after a bitover 1 year I now have 4,5% wear on my Vaios battry, andexcept less than 10 times it always charges to 80% only.

    Now, I think most of that wear was heat - or occured in the summer, in Winter 08 (after about 6 months) I was at 1% wear.

    I suspecgt the wear is due to me using Intel's latest graphics drivers for the X3100 which aren't really compatible with the SZ.

    Why do I say not compatible:
    Well, the GPU runs much hotter, and even crashes on the latest drivers.

    The much weaker stock drivers let the same laptop run cool.


    So: Overall, wear is very small at an 80% charge.
     
  5. Tinderbox (UK)

    Tinderbox (UK) Sir Pumpkin Longshanks

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    How hot the battery gets , by being close to the cpu/gpu can decrease it`s lifetime considerably.

     
  6. DetlevCM

    DetlevCM Notebook Nobel Laureate

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    I know, I've read it before.

    And Intel's newest drivers are pointless in an SZ - they just try to fry the laptop...
    I'm not sure why...
     
  7. John Ratsey

    John Ratsey Moderately inquisitive Super Moderator

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    I've only seen this 80% charge option on a Sony G11 and I wondered if it was because of the very high capacity battery.

    A more effective way to reduce the charge cycles is to have a a threshold below which the charge has to drop before the battery recharges. This avoids the small top-up charges. I've seen this implemented on many notebooks. Fujitsu used to use 90%. Samsung uses 97% (IIRC) and I have just discovered that my Dell E6400 has a threshold of 95% for the 9 cell battery but does top-up charges on the 6 cell! However, the charge rate as the battery approaches 100% is very low.

    John
     
  8. DetlevCM

    DetlevCM Notebook Nobel Laureate

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    Well the 80% and 50% charge limit ia available on the Sony Vaio SZ7 too - that's my laptop :)
     
  9. Tinderbox (UK)

    Tinderbox (UK) Sir Pumpkin Longshanks

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    My Samsung N310 netbook has an 80% charge setting in the BIOS and you can set it in XP also, do the other Samsung netbooks not have this function?

    I think an 90% setting would be better, but maybe they thought it would be too difficult to get 90% 4.1volt per cell every time, and so they went with 4.0volts 80%

    4.2V = 100%
    4.1V = about 90%
    4.0V = about 80%
    3.9V = about 60%
    3.8V = about 40%
    3.7V = about 20%
    3.6V = empty
    <3.5V = over-discharged
     
  10. Phil

    Phil Retired

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    Several Sonys have it. Samsung N120 has it too, N110 and NC10 don't.
     
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