How to Test 18650 Lithium Battery Capacity with Flashlight and Get Approximate Capacity

Introduction How to test the capacity of a 18650 lithium battery with a flashlight and get the approximate capacity. It is definitely safe to use professional capacity tester, internal resistance meter and aging equipment to test 18650 lithium battery, but

How to Test 18650 Lithium Battery Capacity with Flashlight and Get Approximate Capacity

It is certainly safe to use professional capacity testers, internal resistance meters and aging equipment to test 18650 lithium batteries, but this is a professional situation.

If ordinary people want to test the capacity of 18650 lithium battery, they can use the comparison method. Three things are necessary:

1. A standard capacity 18650 lithium battery

You can choose real Samsung 2600mah, which has stable quality.

2. A container and a battery test circuit

Buy a solderless mobile power sleeve (spring loaded) and use it to make a container and a battery test circuit.

3. A 1A Dummy Load Resistor

You can buy a dummy load resistor (1A current) online to test the power bank. Although the production is approximate, the same is usedFor. comparison tests.

Always reliable.

Put the Samsung 2600mAh battery into the mobile power test container, connect the dummy load and start recording the discharge time. It will take approximately 100 minutes before the charging light turns off.

Get this basic setting. Other batteries to be tested may function in the same way. By comparing the test parameters obtained with Samsung batteries, you can find out the approximate capacity of the tested battery.

How to measure the capacity of a lithium battery? How to measure with a multimeter.

To measure battery capacity, you can get the battery capacity by charging or discharging. If you search for “USB voltage display” online, you can see the corresponding products. Choose one with a capacity display. . For products (available in levels above 20), you canPlease discharge the battery to a voltage of 3.5V first, then use the charger to charge. The battery and charger are connected through this product. Once the battery is fully charged, the battery charges. The level will be displayed.

The other is to obtain the capacity through a simple discharge method, which is only a reference value and is not precise. When the battery is fully charged, use a charge to discharge it, for example, fully charge 4.2. V, discharge current 1A, discharge to 3.5V, and calculate the discharge time. It is not allowed to discharge below 4.2V. The voltage will decrease and the current will also decrease, so it is only for reference. .

What are the testing standards for lithium batteries?

The multimeter cannot measure battery capacity. Battery capacity refers to the total amount of electricity released once the batteryrie is fully charged and discharged until it stops discharging. In other words, capacity Q = product of current I and discharge time t. There are special instruments for measuring other battery parameters, such as battery testers.

A multimeter is a magnetoelectric instrument with a rectifier that can measure various electrical parameters such as alternating and direct current, voltage and resistance. For each electrical quantity, there are generally several ranges.

Also known as a multimeter or simply multimeter. The multimeter is composed of a magnetoelectric ammeter (meter head), a measuring circuit and a selector. By changing the selection switch, various electrical parameters can be measured easily.

Detailed information:

< p>Notes on using a multimeter

1. Before using a multimeter. , you must first perform a "mechanical zero adjustment", that is, point the multimeter pointer to the zero voltage or zero current position when no electricity is measured.

2. When using the multimeter, do not touch the metal part of the test lead with your hands. This can guarantee measurement accuracy on the one hand and personal safety on the other hand.

3. When you measure a certain amount of electricity, you cannot change speed during measurement, especially when measuring high voltage or large current, you need to pay more attention. Otherwise, the multimeter will be damaged. If you need to change gears, you must first disconnect the test leads and then measure after changing gears.

4. When using the multimeter, it should be placed horizontally to avoid errors. At the same time, heCare should also be taken to avoid the influence of external magnetic fields on the multimeter.

5. After using the multimeter, the transfer switch should be set to the maximum AC voltage range. If it is not used for a long time, the battery inside the multimeter should also be removed to prevent it from corroding other components of the multimeter.

Reference documents:

Baidu Encyclopedia - Multimeter

1. Voltage measurement method

That is, the battery power is obtained by simply monitoring the battery voltage. Advantages of this method: simplicity Disadvantages: imprecise, the precision of the power measurement is only greater than 20%. Especially when the battery charge is less than 50%, the phone power calculation will become very inaccurate. The protection of the battery by thisThis method is therefore very limited.

2. Battery modeling method

This method involves creating a data table based on the battery discharge curve. The data table will show the power values ​​at different voltages. Advantages: More accurate than the voltage test method. Disadvantages: Obtaining an accurate data sheet is not simple because the relationship between voltage and power also involves factors such as battery temperature, self-discharge, and aging.

Early developments of lithium batteries

Lithium batteries were first used in pacemakers. Lithium batteries have the advantages of extremely low self-discharge rate and gentle discharge voltage, allowing pacemakers implanted in the human body to work for a long time without recharging. Lithium batteries generally have a nominal voltageale greater than 3.0 volts and are best suited for use as an integrated circuit power supply. Manganese dioxide batteries are widely used in calculators, digital cameras and watches.

In order to develop more efficient varieties, various materials were researched to create unprecedented products.

In 1992, Sony successfully developed lithium-ion batteries. Its practicality has significantly reduced the weight and volume of portable electronic devices such as cell phones, laptops and calculators.

  • 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