macbook pro can't fully charge to 100%

[FS-Zero]

I got the notebook connected to the power connector
I found it to only hold up to 95%
anyone know whats wrong?

 

[Eniregnat]

No, nothing wrong. See this Apple Technical Note and this Apple tech note.

Your computer charges to 100% and then slowly discharges. It will oscillate between 95 and 100%.

Try X-Charge. It will show a graph of how your computer charges and discharges over time. It should work fine on the MBP, but I could be wrong.

Calibrate your battery. Let it run on the battery until it goes to sleep, and then recharge it.

 

[FS-Zero]

Ok, I got X-Charge
but the graph on that program also says the charge is only at 95%...

but are you saying that once the battery was 100%, now its just discharging and the macbook won't recharge it until..say..less than 95%?

 

[Eniregnat]

Yes, It will only trickle charge until 95 or 93%, then it will full charge, and then slowly discharge.

You really need to Calibrate your battery. your battery, if you haven't. The MBP directions are a little different that I gave. See link.

I rewrote my above post, also see the second Apple TN link.

 

[Eniregnat]

Calibrating your computer's battery for best performance
MacBook Pro Battery Calibration
The battery calibration for the PowerBook G4 (15-inch Double-Layer SD) and MacBook Pro has been updated because of a new battery released with this computer. With these computers, follow these steps to calibrate your battery:

Plug in the power adapter and fully charge your PowerBook's battery until the light ring or LED on the power adapter plug changes to green and the onscreen meter in the menu bar indicates that the battery is fully charged.
Allow the battery to rest in the fully charged state for at least two hours. You may use your computer during this time as long as the adapter is plugged in.
Disconnect the power adapter with the computer still on and start running the computer off battery power. You may use your computer during this time. When your battery gets low, you will see the low battery warning dialog on the screen.
Continue to keep your computer on until it goes to sleep. Save all your work and close all applications when the battery gets very low, before the computer goes to sleep.
Turn off the computer or allow it to sleep for five hours or more.
Connect the power adapter and leave it connected until the battery is fully charged again.
Tip: When the battery reaches "empty", the computer is forced into sleep mode. The battery actually keeps back a reserve beyond "empty", to maintain the computer in sleep for a period of time. Once the battery is truly exhausted, the computer is forced to shut down. At this point, with the safe sleep function introduced in the PowerBook G4 (15-inch Double-Layer SD) computers, the computer's memory contents have been saved to the hard drive. When power is restored, the computer returns itself to its pre-sleep state using the safe sleep image on the hard drive.

Can hurt to post this.