Answer：After the battery has discharged the internal stored power and the voltage has reached a certain value, continued discharge will result in over-discharge; battery over-discharge may bring disastrous consequences to the battery, especially high current over-discharge or repeated over-discharge, which will have a greater impact on the battery. Generally speaking, over-discharge will cause the internal pressure of the battery to rise, the reversibility of the positive and negative active substances will be damaged, and even if recharged, it will only partially recover, and the capacity will be significantly decayed.