For various reasons we have not been away in our van since the summer. We have taken it out for the day to keep the battery topped up but have not had anywhere to plug in to electrics. I had assumed the leisure battery got topped up when we drove it. My husband took the van out today but says that a light has come on for the 2nd battery. It was new 2 years ago. Does this mean we are not driving it far enough? Or does it just need plugged in more often? Excuse our ignorance! Can anyone explain what we need to know about keeping our batteries health!