Im wondering how much the calibration actually means to the longevity of the battery. I admit I didn't go the full 5 hours after it went into sleep from lack of power. More like 2 hours or so, and then charged it up again. But the fact remains now that I only get around 4 hours of usage, and this is when only browsing on the forums while listening to iTunes with headset connected. What sort of battery time are you guys getting? Should I just bite the dust and do a proper calibration this weekend? Or could this be attributed to a bad battery? Atleast... 50% of ideal battery time is not acceptable to me So I'll do whatever it takes to get back to max.