After calibrate battery, my battery health drop 3%...

[matrix07]

from 96% to 93%, while it took 5 months to drop from 100% to 96%.

Is this normal? Doesn't look like it for me.
Is calibrate battery necessary?

 

[Newtons Apple]

Sometimes the true battery health is not known until you do a calibrate.

These batteries do not last forever.

 

[matrix07]

Sometimes the true battery health is not know until you do a calibrate.

These batteries do not last forever.

Oh.. I see.

 

[Atomic Walrus]

Also, don't calibrate your battery. Apple has updated all of their battery info and no longer recommends intentionally adding cycles to the battery for any reason (calibration, "exercise," etc).

www.apple.com/batteries/

"With lithium-ion batteries, the capacity diminishes slightly with each complete charge cycle."

In your case you didn't actually cause the battery to lose 3% of capacity (that's just the effect of calibration), but in general it's not worth doing a deep discharge just to increase battery capacity accuracy slightly.

 

[GGJstudios]

from 96% to 93%, while it took 5 months to drop from 100% to 96%.

Is this normal? Doesn't look like it for me.
Is calibrate battery necessary?

The built-in batteries in the newer Mac unibody notebooks come pre-calibrated and do not require regular calibration like the removable batteries in older Apple notebooks.

Your battery is fine. It is perfectly normal if your battery health (maximum capacity) is more or less than 100%, even when brand new, or if it fluctuates up or down over time. The gradual decline is not in a straight line downward, and it may decline more rapidly at some times and slower at others. For further details, read the CHECKING STATUS AND HEALTH section of the following link.

​

The link below should answer most, if not all, of your battery/charging questions. If you haven't already done so, I highly recommend you take the time to read it.

Apple Notebook Battery FAQ​

 

[matrix07]

Also, don't calibrate your battery. Apple has updated all of their battery info and no longer recommends intentionally adding cycles to the battery for any reason (calibration, "exercise," etc).

www.apple.com/batteries/

"With lithium-ion batteries, the capacity diminishes slightly with each complete charge cycle."

Oh.. well...

----------

The built-in batteries in the newer Mac unibody notebooks come pre-calibrated and do not require regular calibration like the removable batteries in older Apple notebooks.

Damn.....

I'll read your link. Thank you.