So I have a 2013 11' Macbook Air i5 with 256gb SSD. With mountain lion I do my work, close the lid, come back a week later and I only go down a few percent. With Mavericks however, I do a little work, close the lid, come back 3 days later and my Mac is completely dead. When I plug in the charger and it boots up, its at 3% battery. Anyone know why this is? I went into Settings, Energy Saver and Power Nap is turned OFF in battery mode and OFF in Power Adapter mode. Prevent computer from sleeping automatically when display is off has no check mark. Put hard disks to sleep when possible is checked. Is there anything else that I should change in settings anywhere? It was amazing walking away for a week and coming back and having virtually the same amount of battery as before but now with Mavericks DP5 this is not the case. I did search the forums but did not find anything relevant to this exact issue but I can't imagine I'm the only one experiencing it. Much appreciated. UPDATE: This issue remains on DP6. I have updated and still getting battery draining. In addition today my macbook just shut off at 19% battery. Plugged in the adapter and it rebooted after about 2 minutes. Wondering if maybe the battery percentage is off too..