I had an issue with my battery not showing a charge at all. I knew it was charged because I ran it for more than a few hours (8+) with wifi and BT turned on before it crashed. I then charged it up for a long time (8hours+) and it still read the battery as 0%.
After reading a bit on the issue, I cracked it open using these methods ( http://www.techrepublic.com/blog/cra...without-flaws/
) and what I found was shocking. Not only were there two screw missing, but 3 screw mounts had been screwed so tightly that they were busted. (Major sad face)
I then disconnected and reconnected my battery, and powered the device on... It worked fine, and the batter had a reading again.
Something must have nudged that loose battery just right...