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Comment by jffry | Hacker News Reader

running

  ioreg -l -n AppleSmartBattery -r | grep -i capacity

gives me

  "MaxCapacity" = 8329
  "CurrentCapacity" = 8002
  "DesignCapacity" = 8440

I'm guessing MaxCapacity or CurrentCapacity (I'm at 100% charged on a ~1 year old MBP, so I don't know which number is appropriate)

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Your battery percentage is going to be:

    100 / DesignCapacity * MaxCapacity

Or, in the way that makes way more sense to me:

    MaxCapacity / DesignCapacity * 100

Which, with your results, yields something to the effect of:

    98.68%

It's kind of (read: very) dirty looking, but you can get the same result with:

    echo $(ioreg -l -n AppleSmartBattery -r | grep MaxCapacity | awk '{print $3}') / $(ioreg -l -n AppleSmartBattery -r | grep DesignCapacity | awk '{print $3}') \* 100 | bc -l

    ioreg -l -n AppleSmartBattery -r | awk '/MaxCapacity/{mc=$3};/DesignCapacity/{dc=$3};END{print 100*mc/dc}'

mine is at 103.211

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