1. In theory, it cannot be directly used: When the electric vehicle battery is completely discharged, it usually cannot start the electric vehicle directly because the battery does not have enough power to drive the motor.
2. Can be used after charging: Although the battery is completely discharged, as long as the battery itself is not physically damaged, it can be charged through appropriate charging devices to restore its power and continue to be used.
3. Long term effects should be noted: If the battery is completely discharged for a long time, it may have adverse effects on the battery life, such as internal crystallization and capacity reduction. It is recommended to charge the battery regularly to maintain its health.