I just got my BTO 15inch 1.25 Ghz with Combo drive and 4200RPM 60GB. I "calibrated" the battery by running it until the computer went to sleep, and then giving it a full charge. Still a full battery and lowest power consumption without running intense tasks (I have iChat, Safari and iTunes running) and I have only about 1:45 life. I know that Apple's site says 5 hours depends on consumption, but the only way I think I could get this computer to last five hours without being plugged in would be to either put it to sleep or shut it down. Is there something I'm doing wrong? How is it that Apple can claim five hours (what math do they do to arrive at that number)?