Solar street lights are powered by the solar panels. The solar panels charge a rechargeable battery in during the day and supplies power to a fluorescent light or LED lamp during the night. If there is ever a cloudy sky for a few consecutive days, a powerful back-up energy is needed to support the normal operation of the solar street lights. CSDWELL will be your best choice for a solar street light lithium battery. CSDWELL’s lithium ion battery packs and ultracapacitor with superior electrochemical characteristics, safety and thermal stability, presenting the optimum battery solution for a green, environmental-friendly illumination system.