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Charging a car's starting battery usually takes 20 hours.

When the car is running, it will use a generator to replenish the battery, but when the battery is severely depleted, it needs to be replenished in a timely manner. The charging capacity of the car alone is not enough, so a portable charger can only be used to charge the battery. Charging the car's starting battery takes 20 hours.

Taking 12V60Ah as an example, the charging method is to use constant voltage current limiting method for charging, with a constant voltage of 14.8V and a current limiting of 15A for charging for 16 hours, followed by a constant current of 3A for charging for 4 hours, for a total of 20 hours.

If the battery is fully charged, it can be judged based on the following phenomena, or if the electric eye is green, it means it is fully charged:

1) A large number of bubbles are generated inside the battery, resulting in boiling phenomenon;

2) The terminal voltage rises to its maximum value and does not rise again within two hours;

3) The electrolyte rises to its highest level and does not rise again within two hours.

Possible causes of car battery failure:

1. After the car engine stops running, high-power appliances such as air conditioning and music players that are forgotten to turn off can cause serious battery depletion. It is absolutely not advisable to use them in this way for a long time.

2. At the end of the battery's lifespan, it will no longer store electricity or self discharge quickly.

Generally, a new battery needs to be charged for 24 hours.

The normal lifespan of car batteries is generally around two years. Proper maintenance can extend the lifespan, and the best ones can last for over 4 years. Let me tell you something to pay attention to:

1. When starting the car, the starting time should not exceed 3 to 5 seconds each time, and the interval between restarts should not be less than 10 seconds.

2. Frequent short distance driving of cars, starting and stopping, can lead to the battery being in a state of insufficient charging for a long time, shortening its service life. Driving at a stable speed on the highway for 20? 30 minutes can give the battery sufficient time to charge.

3. During daily driving, before leaving the car, check and ensure that all headlights and other electrical appliances (such as radio, CD) are turned off. Because this may deplete your battery.

4. If the battery runs out and needs to be ignited (Jump Starting, also known as grounding) to start, you should immediately try to drive at a constant speed (such as highway speed) for at least 20 seconds? 30 minutes, fully charge the battery.

5. Even if the battery is completely discharged, borrowing a flame may not be able to help you start the car. At this point, you need to use a specialized battery charger for slow charging.

6. If the car is left unused for a long time, it should be fully charged first.

1. In general, a small car's engine can be charged for more than 60 minutes at 1500 rpm or above, and then charged for more than 60 minutes at 1900 rpm or above to fully charge half of the battery.

2. When the battery level is below half, i.e. the voltage is below 13.4V, the car will have difficulty starting and the battery warning light will light up.

3. The car is driving on the highway, and after 2 hours without using high-power appliances such as air conditioning and headlights, the battery is basically fully charged.

4. In actual use, it is impossible for the battery to be fully charged,

The reason is:

a. The battery needs to have a so-called "trickle" charging in order to fully charge the battery, that is, to fully charge it,

b. In order to meet the operation of on-board equipment, the small car generator outputs a large current that far exceeds the optimal charging current of the battery. This current cannot fill the battery,

c. During the operation of the car, the electricity consumption is uneven, and there may always be current flowing in and out of the battery.

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