I have a 2001 S60 2.4T. While I was out of town there was a power failure at my house and the battery maintainer shut off and my battery completely discharged. I put a 10 amp charger on the battery without disconnecting the battery. I heard some strange sounds in the car. Immediately I disconnected the charger and isolated the battery by disconnecting the ground cable. I then charged the battery to full charge. The car started and ran fine, but now the speedometer, trip computer, and alarm screen (door ajar, etc.) are not working.

Have I done permanent damage to something, or is there a fix?

Thanks

George Harper