Ask HN: Should I unplug my laptop charger at 100%?

Re:Ask HN: Should I unplug my laptop charger at 100%? by johnymontana on Monday May 04, 2015 @04:44PM (#9489057)

Could you clarify how you arrived at 84% battery health? After the command "ioreg -l -n AppleSmartBattery -r" I see DesignCapacity, but where does the other number (5629) come from? I'd like to compute battery health myself...

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Re:Ask HN: Should I unplug my laptop charger at 100%? by jffry on Monday May 04, 2015 @04:52PM (#9489118)

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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Re:Ask HN: Should I unplug my laptop charger at 100%? by ChristianBundy on Tuesday May 05, 2015 @12:04AM (#9490791)

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

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Re:Ask HN: Should I unplug my laptop charger at 100%? by cgabios on Tuesday May 05, 2015 @04:56AM (#9491520)

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

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Re:Ask HN: Should I unplug my laptop charger at 100%? by critiq on Tuesday May 05, 2015 @07:34AM (#9491916)

mine is at 103.211

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Re:Ask HN: Should I unplug my laptop charger at 100%? by bluedino on Monday May 04, 2015 @04:50PM (#9489095)

He's just dividing the current battery capacity by the 'new' battery capacity. You can just let a program like Coconut Battery do it for you.

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Re:Ask HN: Should I unplug my laptop charger at 100%? by mauz0r on Tuesday May 05, 2015 @07:49AM (#9491949)

Coconut Battery is nice. You can let it take snapshots and compare it with other batteries online. You can view my battery health here http://ccbonline.coconut-flavour.com/index.php?bid=d78a6c124.... I try to unplug at 100% and recharge it at 10-20%. Once per month I drain it all the way to 0%.

After reading this thread I try to keep my battery at a 50-80% charge :)

Except when I do some CPU intensive stuff like compiling or rendering, then it is being charged thought the process.

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