What are the effects of disconnecting the battery negative terminal?

[DeKimberly]

Disconnecting the battery negative terminal will reset the system time, trip mileage, and driver habit information on the car to factory settings. After restarting the vehicle, you will need to reconfigure these settings according to your personal preferences. Some high-end models may also display fault codes, which can only be cleared by a technician at a 4S store or auto repair shop using specialized diagnostic equipment. If the battery is drained, the car will be difficult or even impossible to start. In such cases, you can use a battery charger or the jump-start method to recharge the battery. Jump-starting involves connecting the positive and negative terminals of the drained battery to another car's battery using jumper cables. During long-term parking, it's recommended to start the vehicle regularly—preferably once a week—and let it idle for a while to allow the alternator to charge the battery.