You should try taking off the rear panel of the controller and checking to see if the spring connectors from the batteries to the motherboard are still attached properly. If they are, consider blowing some compressed air on them to clear dust that may be inhibiting the connection. The battery contact springs are held in place by slots in the battery housing in the rear case. [guide|3291|Here] is a link to the guide for removing the rear panel. It's a pretty simple procedure and is worth a try.