I own a 2015 F3-S that was manufactured in May of '15. I bought it in January of '16. I have 38,000 miles on it and it still has the original Yuasa battery. I keep it on a battery tender/maintainer in my garage when not riding. In September I will be riding to California for the NorCal Spyder rally. I expect to put on 6,000 to 7,000 miles on the trip. I was contemplating replacing the battery before the trip to be extra cautious. Is that a good idea?