Best charge level for storing batteries?

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  • dood
    Deputy dood
    • Mar 2004
    • 2462
    • USA

    #1

    Best charge level for storing batteries?

    I just got in a few new batteries for the Latitude C series. They are new manufacture fron Dell, Dated 2007.6.1

    They got here with one light lit on the battery meter. Is this the best way to store them, or should I give 'em a full charge? I don't know how long they'll be stored.
    Ludicrous gibs!

  • kikkoman
    Badcaps Veteran
    • Jul 2007
    • 691

    #2
    Re: Best charge level for storing batteries?

    Storage at about 70% is optimal.
    Keeping Li-Ion batteries fully charged all the time can be fatal, depending on the charging circuit the manufacturer uses.
    Some charger ICs have a shutoff voltage of 4.4V or even more. I have no idea what's going on in some people's heads... anything above 4.2V seriously decreases the battery lifetime.
    Even 4.3V cause a Li-Ion cell to fail after 500 instead of 1000 cycles.
    It's all about the money I guess.
    "Every normal man must be tempted at times to spit on his hands, hoist the black flag, and begin slitting throats." - H.L. Mencken

    Comment

    • Harvey
      Badcaps Veteran
      • Apr 2007
      • 264

      #3
      Re: Best charge level for storing batteries?

      If they are Lithium-ion then the recommendations I've seen suggest to charge to about 3/4, and store them cool, somewhere like a fridge, recharging them every 6 months or so.

      However, have a read of http://en.wikipedia.org/wiki/Lithium_ion_battery, especially the part about disadvantages.

      Comment

      • dood
        Deputy dood
        • Mar 2004
        • 2462
        • USA

        #4
        Re: Best charge level for storing batteries?

        thanks for the wiki link. I've decided to charge them to 50%, then store them in the fridge.
        Ludicrous gibs!

        Comment

        • toastygoodness
          Badcaps Veteran
          • Jul 2005
          • 813
          • United States

          #5
          Re: Best charge level for storing batteries?

          if you go to notebookreview.com's forum, they have this one post on optimizing the battery and how to charge it, etc. see these threads:

          http://forum.notebookreview.com/showthread.php?t=25451
          http://forum.notebookreview.com/showthread.php?t=91846
          http://forum.notebookreview.com/showthread.php?t=106773

          Comment

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