You posted about starting issues with this riding mower back in 2016. Does it still have the same battery? I have been shopping for a BCI U1 battery myself this week for one that's dying after 3 years. If yours is 5 years old, I'd just replace it as a starting point. The light may be due to charging system issues and not the battery, but the battery is long in the tooth and a new one is fairly cheap.