I had the same problem, I dropped it and the battery was out of place. It actually is kinda sensitive, so I tried as many things as you did, but in the end I had to put a little piece of ducktape on one side to push the battery against its corresponding metallic slots. It's kinda hard to explain, I made a little square thick enough to make the battery fit better into the space. What I think happened is, It fell so hard that the battery actually shrunk and wasn't touching the slots therefore not charging nor anything.