I have the latest 2011 Macbook Pro. Sometimes I notice that even when I'm plugged in, the battery status says "Not charging" even when I unplug it and the battery is at 35%.
This mainly seems to happen if my laptop is under load. I had some flash thing going and I could hear the fan. Once I closed flash it started charging again. This can be very annoying if I want to unplug and take my laptop somewhere.
Why isn't my MBP charging?
Best Answer
Some obvious causes:
Due to the way batteries work, they can be out of tolerance / spec at only a specific portion of the entire voltage range. The sensors will correctly detect “good battery” until you reach that one point where the voltage drops too fast and shows aging or a problem with the cells.
Do a calibration run at your earliest convenience if your battery doesn’t continuously self regulate and calibrate. Next, think about a visit to the genius bar or other Apple Support / service desk if the problem continues. Take your wall adapter with you when you go as it can be checked with the mac together.