What to do if the voltage of 18650 lithium battery is too low

Introduction What to do if the 18650 lithium battery voltage is too low Use a battery or device with a higher voltage than your 18650 lithium battery if possible (preferably). Be careful not to exceed 5V in a single section.

What to do if the voltage of 18650 lithium battery is too low

If possible, use a battery or device with a higher voltage than your 18650 lithium battery (preferably). Note that a single section should not exceed 5V, and it is best to limit the current. Charge and unplug your 18650 lithium battery to see if it can start. If so, it can be loaded and unloaded normally. If not, it may be broken. I hope this helps you.

We all know that if the battery voltage is too low, the car will not start and catch fire, so what should we do if the battery voltage is too low ? What is the normal battery voltage?

Method 1: When starting the vehicle, listen carefully to see if the engine makes a “hmm” sound. If so, the vehicle battery is dead. The way to deal with this situation is simple: just charge the car battery in time.

Method 2 : Another situation is that the car battery is broken. At this point, you can test the car battery and generator at the same time to see if they can work properly. If the car battery or alternator is found to be defective, they should be replaced promptly.

Method 3: If the car shows that the battery voltage is too low, but the car can ignite normally, then the problem is not serious and the car owner can fix it. 'ignore.

In addition, in daily use, try to avoid turning on the lights or listening to the radio for a long time when the engine is off when parking for a long time, you should also turn off unnecessary items; electrical equipment (interior and exterior lighting, audio and navigation, etc.) power supply. ).

The battery voltage of our family cars is essentiallyof 12 volts, but if you measure it, you will find that the battery voltage is often higher than 12 volts when the engine is off, and the voltage measured when the engine is idling will be higher. In fact, this is not a battery problem, but a normal phenomenon. This would be a problem if the voltage measured with the engine off was 12 volts or less.

Some people here may have questions: The voltage listed on the battery is 12 volts. Why is the actual voltage higher than 12 volts? In principle, this is determined by the properties of the lead-acid battery, or it can be said that it is determined by the chemical reaction properties of the lead-acid battery itself. Generally, the batteries we use convert chemical energy into electrical energy. The voltage generated by this chemical reaction is determined and cannot be modified.

For example, the essence of the releaserge of a lead-acid battery is the flow of electrons generated by the reaction of lead and dilute sulfuric acid. The maximum voltage generated by this chemical reaction is only 2.4 volts, which fluctuates. depending on the intensity of the chemical reaction, roughly around 2 volts. Therefore, in order to obtain a higher voltage, we need to build several chemical reaction units of lead and diluted sulfuric acid inside the battery and connect them in series to increase the voltage. Each reaction unit is called a monomer and the voltage produced is called monomer voltage. The cell voltage is only related to the principle of chemical reaction and has nothing to do with the size of the battery. Even if you build a lead-acid battery as large as a house, if it contains only one reaction unit, its voltage will still be 2 volts.

The voltage of lead-acid batteries is 1.5 to 2.4 volts and the median value de 2 volts is called nominal voltage. Therefore, there are actually 6 lead-acid batteries working together inside the vehicle's lead-acid battery. When connected in series, a voltage of 12 volts can be obtained. When the battery is fully charged, releaseThe chemical reaction is violent during electricity. The maximum cell voltage is 2.4 volts and 6 cells connected in series is 14.4 volts. The chemical cutoff voltage is 1.5 volts, so when the battery voltage approaches 9 volts, it means the battery is about to die. In other words, although the nominal voltage of the vehicle battery is 12 volts, the actual voltage is between 9 and 14.4 volts. The higher the voltage in this range, the greater the power.

There are also lithium batteries used in our daily lives. Depending on the power level, the battery cell voltagelithium is 2.75 to 4.2 volts and the nominal voltage is 3.7 volts. It can be seen that the voltage of lithium batteries used in daily life is basically a multiple of 3.7. For example, many drone batteries have three batteries connected in series, so their nominal voltage is 11.1 volts, but the actual measured full-charge voltage is higher than 12 volts. There are also lithium batteries for balance cars with a nominal voltage of 36 V, but in fact the full charge voltage is higher than 40 V.

For lead-acid batteries, the voltage of Ideal single charge should be 2.7 volts, which means the voltage generated by the car's alternator should reach 16.2 volts to fully charge the battery. However, considering the voltage resistance of electrical devices in cars, the maximum generator voltage is limited to 14.5 volts. Therefore, in theory, ifthe car battery is charged only by the generator, it will never reach a truly fully charged state. However, compared to the working state of a car battery, this is sufficient.

From the above we can deduce common sense:

1. When the engine is off, it is normal for the battery voltage to be above 12 volts. The higher the voltage, the more powerful the battery. If the battery voltage is often around 12 volts or even lower than 12 volts when your car is turned off, this means that the battery's performance has decreased and you may consider replacing it.

2. The output voltage of the car generator is constant and can charge the battery even at idle speed, but the charging efficiency is not as high as at high speed.

3. There is no need to deliberately charge the battery during daily use, as the battery does notcould not be fully charged by the generator voltage alone. If you really want to fully charge the battery, you can consider using a charger (as you can see in the picture above, when charging a 12 volt battery, the charging voltage is 16, 6 volts, which once again proves that the car generator cannot fully charge the battery).

4. If possible, you can use a special charger to charge the battery every 1-2 months, which can extend the life of the battery. Don't worry if you don't meet the requirements. As long as you don't discharge too much during daily use, it can be used for several years.

One million subsidies for car purchases

  • Popular Focus
  • Where is the cheapest battery wholesale?

    Where is the cheapest battery wholesale in Tangxia, Sanyuanli, Baiyun District? There is an enterprise specializing in the independent production of electric vehicles in Tangxia, Sanyuanli, Baiyun District, Baiyun Sanyuanli Avenue, Baiyun Sanyuanli Street
    08-02
  • Four 3.7V lithium batteries in series and parallel produce 7.4V/4.4A. How to reduce it to 4.8V/4.4A?

    Four 3.7V lithium batteries in series and parallel produce 7.4V/4.4A. I personally think it is impossible to reduce it to 4.8V/4.4A. Because the discharge platform of lithium batteries is generally set
    08-10
  • What are the materials of the negative electrodes of lithium batteries?

    What are the materials of the negative electrodes of lithium batteries? The main commercial applications of lithium batteries include graphite, which is a sheet of copper used to guide current and which does not react. another safe
    08-02
  • The difference between 18500 and 26500 batteries

    What is the difference between 18500 and 26500 batteries? The answer above is 18650. The person asking the question should ask what is the difference between 18505 and 26500 batteries. In the case of Fuant ER1
    08-02
  • What does 3.7V 80mAh written on a lithium battery mean?

    What does 3.7V 80mAh written on a lithium battery mean? 3.7 V, 80 mA = 0.08 A, H means 1 hour, or 3600 seconds. Taken together, it is
    08-02
  • How long does a lithium battery (cell phone battery) last?

    How long does a lithium battery (cell phone battery) last? The lifespan of mobile phone batteries, under normal conditions of use and without serious impact, the lifespan set by the manufacturer must be 5 years.
    08-02
  • Will lithium batteries explode when charging?

    Will lithium batteries explode when charged? Will lithium batteries explode when charged? Lithium battery explosions usually occur during the charging process, because the negative electrode material of lithium batteries is graphite or other carbon materi
    08-02
  • Parameters of lgdas31865 lithium battery

    Parameters of lgdas31865 lithium battery The parameters of lgdas31865 lithium battery are as follows: LGDAS31865 is a model 18650 lithium battery with a capacity of
    08-02
  • What are the main components of lithium battery electrolyte?

    What are the main components of lithium battery electrolyte? The composition of lithium battery electrolyte is shown below. 1. Ethylene carbonate: molecular formula C3H4O3. Colorless transparent liquid (>35℃), room temperature
    08-02
  • Who are the lithium battery manufacturers in Shandong?

    What are the lithium battery manufacturers in Shandong? Shandong Shengyang Power Supply Co., Ltd. and Shandong Weineng Environmental Protection Power Technology Co., Ltd. 1. Shandong Shengyang Power Supply Co., Ltd. is located in Shengyang, Qufu City.
    08-02
  • Types of drone batteries available in 2024

    Part 1. Types of drone batteries available in 2024In 2024, drone batteries have advanced significantly, offering a range of options to cater to various needs in
    07-30
  • How long does it take to charge 26650 battery?

    How long does it take to charge a 26650 battery? The charging time for a 26650 battery is generally between 3 and 6 hours, but the precise time depends on the power of the charger and the capacity of the battery. in general
    08-02
  • For what?Sure, here's an article based on the phrase "For what?

    The simple yet profound question, "For what?" often serves as a gateway to deeper reflections on purpose and intention. It is a query that invites us to delve into the reasons behind actions, decisions, and circumstances that shape our lives and the wor
    08-02
  • Choosing the Right Cart Battery

    This comprehensive guide will walk you through everything you need about cart batteries, from understanding different types to making an informed purchase decision.
    08-02
  • 30mAh~500mAh 3.7 V Li-ion Battery

    Welcome to Ufine's collection of 3.7V lithium-ion batteries ranging from 30mAh to 500mAh. Explore a diverse range of compact and lightweight batteries suitable for various electronic devices,
    08-02
  • Here are 10 essential facts about drone batteries for 2024.

    10 Key Facts About Drone Battery for 2024 In 2024, drone batteries have advanced significantly, offering a range of options to cater to various needs in the consumer, commercial, and industrial sectors. Below are the primary types of drone batteries avai
    08-02
  • Could you please explain the difference among IMR, ICR, INR, and IFR 18650 batteries?

    What is the Difference Between IMR, ICR, INR, and IFR 18650 Battery?In 18650 batteries, discerning the differences among IMR, ICR, INR, and IFR types is fundamental for tailored and efficient battery usage. These distinct
    08-02
  • Safety considerations for cart batteries

    Selecting the ideal cart battery is crucial for ensuring optimal performance and longevity of your electric vehicle or vaping device. This comprehensive guide w
    08-01