I calibrated my 17" MBP last night. However, unplugging it today leaves me somewhat perplexed. My battery meter's fluctuating. It was at almost full brightness when I unplugged it and said 4:30. Then it jumped to 3 hours and a little bit. Once I brought the brightness down to half and it read 3:30 and then began climbing/spazzing. It later went up to 3:46, peaked at 4:00, then dropped to 3:35. Now, it's slowly climbing again. Anyone know what the deal is?