The application of solar road stud NK-RS-Q7 is aluminum battery (3.2 V / 500 mah). This kind of battery has more capacity and can store enough power. The application of this kind of battery makes the service life of the solar road stud NK-RS-Q7 long, which can reach more than five years. Solar road stud NK-RS-Q7 can work stably (- 20 ° C-80 ° C) at extremely high or low temperature.