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battery showing 97% when full?

M

moveright

macrumors member
Original poster
Apr 18, 2012
59
0
My battery is full but it shows 97%. magsafe cord shows green. I rebooted but still the same. odd.

Any ideas?

MBA 13/128 4 days old.:confused:
 
You may need to cycle your battery. Often times if it starts lingering under 100% there's a good chance you need to do a battery cycle to keep your MacBook in good health.

Please read the following.

A cycle is when the total battery power is less then 50% before it is recharged. The battery electronics monitor the status of the cells during use, and not cycling the battery at least once a week may cause the electronics to get false recordings. It is best to fully drain the battery before you charge it up again. Seeing a fully charged in your battery status monitor as 99% is a good indication to fully cycle your battery.
Click to expand...

http://guides.macrumors.com/Laptop_Battery_Guide
 
moveright said:
My battery is full but it shows 97%. magsafe cord shows green. I rebooted but still the same. odd.

Any ideas?

MBA 13/128 4 days old.:confused:
Click to expand...
The battery may appear to stop charging between 93 percent and 99 percent, because the batteries are designed to avoid short discharge/charge cycles in order to prolong the overall life of the battery.

This should answer most, if not all, of your battery questions:


east85 said:
You should cycle your battery.
Click to expand...
You don't need to cycle the battery. Just run on battery until it drops below 93% and it will charge again.

A cycle is when the total battery power is less then 50% before it is recharged.
Click to expand...
That is not accurate. Read the WHAT IS A CYCLE section of the Battery FAQ.
 
GGJstudios said:
The battery may appear to stop charging between 93 percent and 99 percent, because the batteries are designed to avoid short discharge/charge cycles in order to prolong the overall life of the battery.

This should answer most, if not all, of your battery questions:



You don't need to cycle the battery. Just run on battery until it drops below 93% and it will charge again.


That is not accurate. Read the WHAT IS A CYCLE section of the Battery FAQ.
Click to expand...

Thanks for clearing up that line GGJ.
 
Yeah, it simply does not go into charging mode once it is over a certain capacity. If you run the capacity down and then charge to 100% at once, you can remove the cable and let it go down a few percent. Connect it back and charging will not be re-enabled.
 
I removed the cable and am wearing it down. currently at 32%. we will see.

honestly, I didn't know about the battery FAQ. I'm overwhelmed as a new Mac user. I'm finally getting really comfortable with it. To be fair, I am quite used to Linux so this hasn't been so bad but still.
 
moveright said:
I removed the cable and am wearing it down. currently at 32%. we will see.

honestly, I didn't know about the battery FAQ. I'm overwhelmed as a new Mac user.
Click to expand...
It doesn't have to be overwhelming at all. Just run on battery when you need to, and run on AC power whenever you can. As long as you're not running on AC power all the time, you'll be fine. Disregard any comments about calibration. Your battery doesn't need it.

Since you're a new Mac user, this may be useful:

Helpful Information for Any Mac User
 
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