I have a MacBook Pro 15", early 2011. Earlier this week, I brought it home and plugged it in, and there was an X through the battery. Did an SMC reset, and it started charging again. The next day it stopped again, and the message in the menubar said "No Battery Available." I opened up System Information, and under Power it said there was no battery installed.
Did another SMC reset and System Information was unable to load information for Power. I recently did another SMC reset, upgraded to Yosemite, and am still getting the no battery available symbol. But now this is what's showing up in System Information:
Is my battery completely dead? Is there any way to recharge it, or do I need to replace it?
UPDATE: I forgot to note, I did an AHT on the machine a couple days ago, and it said there was nothing wrong with the hardware. If the battery was jostled loose, wouldn't AHT flag it?