I've had my MBP CD since about August and keep it plugged in nearly at all times except when I go to university. I calibrate once a month and now my battery is barely lasting 2 hours. Is that normal?
it is healthy for the battery to cycle (use it to almost empty) a few times a month. I'm on cycle 16 since November. today i got about 3 and a half to 4 hours, with brightness at 3, bluetooth off.