We must install the LED lights in the battery when you must pay attention to the LED street lamp battery can not be wrong. Check the solar cell module positive and negative mark, make sure the positive and negative connection is correct, apply the multimeter to verify it to prevent the mark and so on. Verification method: with a digital multimeter red and black table pen, respectively, contact the two components of the battery pack, showing a positive value of the red pen corresponding to the electrode is positive, showing a negative value of the red pen corresponding to the negative electrode, the other positive and negative test method with the same this.