I have a phantom x, had it about a year and a half. When I start riding in morning, after it's charged all night, it has all 3 lights lit for about a mile, then the green light cuts off, about 3 miles into ride the yellow light is out, only the red light will stay on under load. I pedal most all the time, just use battery to maintain speed and lighten effort needed. I work about 5 miles from house and the battery has never died on way to work, but I charge it when I get there. It's a flat trip and I weigh 170. The bike has about 500 miles on it. Is this normal? Does the battery need replacing soon? Prodecotech says there is a 30 mile range but i figure it's more like 20, but it still concerns me that it has has only 1 light after 4 miles and it's relatively new. Any thoughts?