Sister Sun is preparing to drive home as usual today。Discovered when it can be started，The car can’t start no matter what，I heard the squeaking sound when starting。Ms. Sun quickly called the 4S store for rescue，The rescuer told her，The battery is dead。But Ms. Sun had already checked it when she went to work in the morning，Air conditioning、The lights are all off，Devices without electricity，Why did the battery suddenly run out of power？

I believe that friends who drive frequently will occasionally encounter the same problem as Ms. Sun。The maintenance staff of the 4S store said，To prevent the battery from suddenly running out of power，The best way is to pay more attention to the "distress signal" sent by your car。This signal has the following forms: First, the starter does not rotate or rotates weakly，So that the starter cannot start；Second, the headlights are darker than usual；Third, the speaker volume is low or even silent。The above problem occurs，Car owners should check whether it is a battery problem。

In order to minimize the power consumption of the battery，Experts from 4S stores put forward two suggestions: first，Avoid leaving the lights on or listening to the radio for long periods of time with the engine turned off；Secondly，Even if the engine is running，If the parking time is longer，You should also put away unnecessary electrical equipment (lights and speakers inside and outside the car、Turn off the power of navigation class, etc.。Develop good car habits，You can avoid unnecessary difficulties。

But in case the battery suddenly runs out of power，There are several ways to “help yourself”。

一，Trolley starting is a familiar and effective emergency starting method，But this is a last resort，Cannot be used frequently，Because doing so will cause some damage to the engine and clutch，In particular, avoid using this method to start automatic transmission vehicles。

二，In order to avoid being unable to charge when the battery is dead，Car owners should prepare a jumper cable in the car，You can buy this in ordinary auto parts stores。However，When connecting jumper cables，Never mistake the order of connecting jumper cables。First connect the positive terminal of the dead battery to the positive terminal of the rescue vehicle battery，Connect the negative terminal of the rescue vehicle battery to the metal part in the engine room of the dead car (ground wire)。After jumper cables are connected，Can start the engine of the rescue vehicle，And slightly increase the engine speed，About 5 minutes later，You can emergency charge the dead battery。After charging is completed，The jumper cables should be removed in the reverse order of attaching them。

The reliable way is to contact the rescue vehicle in time，Then connect the jumper cables，Temporary charging via rescue vehicle，To start the engine。

Expert reminder，Battery life is generally 2 to 3 years。This period has passed，Car owners should pay special attention to daily battery maintenance，Replace in time if necessary，To avoid danger。