Our new white Jazz Executive was delivered a couple of days ago - I drove it in the city, countryside and motorway and the battery indicator fluctuates between 3 and 7 notches, but never shows 10 notches, e.g. full. I love the little car and how it drives, but is there any way to get the battery to show "full", e.g. 10 notches? Or is this not relevant for Lithium batteries?