I have about 35k on my 2012.... she still has the stock batteries. They are working great. However, the temp extremes here in AZ take a toll on the batts. I am thinking I should start looking to replace them soon. I've had great success with Interstate Mega-Tron batteries in my Travel Trailer. I have also used NAPA GOLD Batteries that seemed decent. I'd be interested to see what you are using. THANKS!