, we refer to nanotechnology in battery, waterproof breathable, buried the battery under the permafrost, make our battery has always been in 20 to 25 degrees Celsius in the best working temperature, and general technology are mostly the battery solar street lamps hanging on the light pole or ground (because there is no waterproof design), it is conceivable that in the hot summer, the temperature of the battery box is so high, and elevated temperature every 10 degrees Celsius, the service life of the battery will be reduced by half.