1, special charge and discharge detector, for charge and discharge test.
2, there is no special detector, just use a small detector to detect the battery, and the effect is quite good.
3. Batteries are generally conventional. If there is obvious deformation or bulging on both sides of the battery, be sure to check and replace it. In addition, if there are some white or green powdery objects around the pile head, it means that there is something wrong with the battery, because these powdery objects are oxides in the battery. Generally, this will not happen with newer or better quality batteries.