My battery charge levels stay pretty much around the 3-4 bar mark. I have only twice seen the charge level at Green. That was after going on a rural hwy about 40 mph for 20 miles while the battery charged up. From what I see here, it seems others have higher battery charge than mine is doing. Is this a problem or does it not make a difference if the battery is all full or partly full as long as it has some juice?