no it dosn't. when you loose a light you go maybe a block or so before it dies. the throttle gauge would work great with an old sla battery that slowly looses power however the lifepo4 and lithium batteries are designed to stay at full power then just drop. you should get at least 25 miles with the 15ah battery. i ran mine out once and it was at 27 miles. i think barelyawake got 28 miles. we both have 48v 15ah batteries and that mileage is with no pedaling. i just always throw mine on the charger when i get home. the batteries are supposed to be able to accept thousands of charges without loosing any of the power