My low battery warning did not show up until I had 8 miles left. I had already gone 82 miles and expected that the low battery warning would show up at 20 miles left but it never did. Is this normal? I thought that low battery warnings should begin at 20 miles left and then at 8 miles it would say very low battery and direct me to a charging station. There were no charging stations, except for my home, within 8 miles when the low battery warning registered at 8 miles