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!

    Tags: None
    • 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

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