I have a black MacBook 2 1 and a new replacement battery. At first I had trouble getting the MacBook to power up with the new battery even after charging for a while. So I calibrated it following a video I found on YouTube. http://www.youtube.com/watch?v=jRYIMDQxunI What is happening now is the battery meter is stuck on 89%. I even installed Watts. Watts for Mac - CNET Download.com Watts shows the 89% charge as well. I followed the Watts instructions for calibrating and that didn't help.