It takes 16 hours.
Taking 12V60Ah as an example, the charging method adopts constant voltage and current limiting mode for charging, constant voltage 14.8V current limiting 15A charging for 16 hours, and then charging 3A constant current for 4 hours, a total of 20 hours.
Power loss repair method: 1, the fire line car battery loss can be used to charge and repair the fire line. The so-called fire line is to find another vehicle, use a charging cable to connect the battery electrodes of the two vehicles, and then start the rescue vehicle to charge, and after a period of time, the loss of the tram can be started. It should be noted that, distinguish between the positive and negative terminals, the red line is connected to the positive terminal, the black line is connected to the negative terminal, and then the negative terminal, do not connect wrong. 2, repair instrument after the car battery loss, should be charged with the charger immediately, if the ordinary charger is not charged, it may be the battery voltage is not enough, need to use the high resistance of the repair instrument to repair the voltage increased to more than 10V to fill it. If the battery voltage is lower than 10V, after charging, repair can not be upgraded, you must replace the battery.
The car battery needs to be charged for about 20 hours, the reasons for the lack of power are: 1, forget to turn off the light after parking; 2, the use of external power supply equipment in the state of flameout. The role of the car battery is: 1, to provide power for the car's starter and ignition system; 2, Provide stable DC power supply for automotive electrical appliances. The maintenance method of the car battery is: 1, the battery can not be discharged too much; 2. If the vehicle is not used for a long time, disconnect the battery power supply; 3, avoid causing battery short circuit; 4, often check whether the connection part is firm, port surface is clean to ensure good contact; 5. Do not place metal tools and conductive materials near battery terminals to avoid short circuit