Thanks - sounds sensible. My main concern was not ruining the battery by excessive charging.
You will not ruin the battery by excessive charging, it stops charging when the electronics in the battery tells it it is charged. It won't hurt to leave it in the charger for weeks,
As Neuro said, I would let it partially discharge and then try charging again.
Take your battery, charger, and camera to the dealer if it still does not show fully charged. See if he will put the battery into a display camera, and confirm it shows partially charged.
This will help you determine what the issue is, camera, or battery/charger.