macbook battery stops charging at 98%


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recently, my macbooks battery will not load to 100% although the magsave is connected and all.

coconut is telling me that its overall capacity is at 98%, does it mean its slowly dying on me, because the capacity is just not 100% anymore?

istat pro tells me, its at 100% health, coconut says the charger is not connected although it is and istat seconds that its connected to power and yea, it just stops charging at 98%, as said.

mini battery logger even tells me that its at 5140/5020, which would be an even greater capacity then it actually should have but i know that happens sometimes.

im just a little confused by the different information i get.

my mac is 16 months old, its a blackbook 2,0 c2d...

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I see this all the time. The battery has a feature in it to stop overcharging and this sometimes cuts in to early.

Also worth noting is: If the battery is over 95% full and you connect the adapter it will not charge. Again this is intentional. the battery needs to be drained past 95% then plugged in. This is to try and limit charge cycling which can reduce the batteries lifespan quite dramatically.

is that a new feature with 10.5.2?

sorry for my dumbness but... yeah... ;)

No, it's hardware based so it's been there the entire life of your Mac.

One thing you can try is a battery calibration.

http://docs.info.apple.com/article.html?artnum=86284

I done this the other day and I'm getting at least another 10-20 minutes out of it now

It's not good to fully ( 100% ) charge your battery. Dell has been using such limitation for a while now. I'm sure you can find more about "overcharging" your laptop battery on Google but I am too lazy now. ;)

Noteworthy: The Safari spellchecker doesn't recognise the word "Google".

is that a new feature with 10.5.2?

sorry for my dumbness but... yeah... ;)

As has been mentioned already it is part of the hardware, the Battery has a chip in it which manages this function (and a few others).

My MacBook is currently at 99% and has stopped charging which is normal.

Calibrating the battery will not fix this, as it's technically not an issue, it is by design.

As has been mentioned already it is part of the hardware, the Battery has a chip in it which manages this function (and a few others).

My MacBook is currently at 99% and has stopped charging which is normal.

Calibrating the battery will not fix this, as it's technically not an issue, it is by design.

Mine stopped at 98%.

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