So I've had my MBP just over a year. Throughout that time the computer has almost been exclusively on AC power (although I turn off the outlet at night). Never calibrated my battery or anything as I didn't realize these batteries had such crazy maintenance requirements. Anyway, last night I decided I'll calibrate after reading a lot online. I pulled the AC and left it on. Somewhere around 80% charge it suddenly dropped to about a 30% charge. Everything else is normal. When I finished charging it back up it charged, but now says "Service Battery." In addition, in system profiler Full charge capacity (mAh) = 3316 and Cycle count = 54. I've tried calibrating again, I've reseated the battery twice and I've reset the SMC a couple of times. No change. This computer is literally 2 weeks out of warranty. Is it normal for the batteries to go bad like this? Should I just bite it an buy a new one?