D5100 Battery Problems
Just an update as I posted this a while ago. I took it to Blacks (where I purchased it) and they were abel to charge it, so we concluded it was a charger issue. I then took it directly to Nikon in Mississauga. They were awesome! They filled the work order and gave me a new one within half an hour (usually this can take up to 2 weeks because of processing).
If your battery is still under warranty, I would take it in and get a new one. But try charging on a different station like I did because it might be the charger.