... 000hoursBattery, high Efficiency, Maintenance-free Lead-Acid Battery or Gel battery, A, Our battery casing is designed specially for solar applications, ... leakage & water seepage when the battery is buried underground.B, Life span ≥5year , Gel battery: ≥8 yearsController, intelligent digital ... field Solar street lamp project case Solar street light Wiring diagram DC12V system solar garden lamp