After reading about Smoke detector Batteries on another thread , I decided to check out all batteries. I topped off the chasis batteries with distilled water, and will be checking out the coach batteries next. I have not replaced or even inspected the Coach batteries since I bought the Coach as they are located in th middle of the coach and it is a half day job easily to access them . I want to check the manufacture date on the Coach Batteries to see if they are original. That woulld put them at 5 years old.