My 12 volt batter on my 2018 Clarity has an battery state indicator window. In the 3.5 years that I have had the car, the indicator has remained "OK". I check it with every tire rotation and it's always the same, OK. I assumed that everyone's Clarity 12 volt batteries would be the same. Do yours not have this feature? My wife's 2017 Honda CR-V's battery failed just after the warranty expired. It did not have any sort of monitoring window.