New apple batteries only at 74% when fully charged?

Discussion in 'Mac Accessories' started by jbg232, Oct 4, 2010.

  1. jbg232 macrumors 65816

    jbg232

    Joined:
    Oct 15, 2007
    #1
    I picked up a pair of the apple batteries/charger for use with my magic mouse and wireless keyboard. I still had some juice in my current batteries so charged each set of two batteries for 24 hours and then put them in a drawer. Fast forward two weeks and my magic mouse has reliably run out of juice and when I put in two of the batteries, my mac states the charge at 74%. I've read in some of the other posts that because of the way NiMH and alkaline batteries differ, it is normal to have slightly lower ratings, but 74%?????

    Most people reporting stated they got 85%, has anyone else gotten 74% on first run?

    Are these batteries defective or is there something about my charging routine that caused them to be so much lower?

    Please advise.
     
  2. MikhailT macrumors 601

    Joined:
    Nov 12, 2007
    #2
    That’s normal for the first couple of charges on brand new batteries, it can take a couple of charges to “calibrate” itself to the full capacity ( ~95% at most). Also those type of batteries do discharge over time, you stated you didn’t use it for two weeks. They do not stay 100% all year long, they “keep” the ability to charge to 100% capacity. I know the marketing says they stay that long but marketing is never the truth.
     

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