Your warranty period does not change. It is still 100,000 miles or 8 years from the in service date. If the car was sold new in California I believe the traction battery is good for 150,000 miles or 10 years. They had to remove a lot of stuff to get access to the traction battery. Rear carpet, side panels seats, etcetera. Your 12 volt battery was getting long in the tooth. It is good you replaced it. Enjoy your car!