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If it's an individual, find an adjustable load resistor and a current adjustable DC power supply to calculate the battery capacity based on the charging and discharging time,

Charging current x charging time=battery capacity (charging from 2.7V or 3.0V to 4.2V)

or

Discharge current x discharge time=battery capacity (discharge from 4.2V to 2.7V or 3.0V)

Measure the no-load voltage of the battery using the BAV-1 voltage tester.

two

Apply a 15 Ω resistor load to the BAV-1 voltage tester, operate for 5 seconds, and read the load voltage of the battery.

three

After one day of storage, use the Xinwei battery discharge tester to discharge the battery and test its capacity. For disposable lithium-ion batteries with a voltage of 3.0V and 3.6V, set the discharge current to 30mA and the cut-off voltage to 2V without interruption.

The setting of the Xinwei battery discharge instrument before discharge is shown in the following figure

Lithium battery voltage and capacity detection

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After the discharge is completed, right-click and click "Open Data". In the pop-up dialog box, click "File" - "Save As" to save the discharge data with a discharge curve graph.

Lithium battery voltage and capacity detection

A multimeter cannot measure the capacity of a battery.

Explanation: Measuring short-circuit current (if the current value is within the allowable range of the multimeter and the battery) can only compare the power level of the same type of battery. Different models cannot be compared because the standard internal resistance of batteries of different models is different, and even if the power of the memory is the same, its short-circuit current is not the same.

In addition, multimeters, also known as multiplexers, multimeters, triple meters, and multimeters, are indispensable measuring instruments in power electronics and other departments, generally aimed at measuring voltage, current, and resistance. Multimeters are divided into pointer multimeters and digital multimeters according to their display methods. It is a multifunctional and multi range measuring instrument. Generally, a multimeter can measure DC current, DC voltage, AC current, AC voltage, resistance, and audio level. Some can also measure AC current, inductance, and some parameters of semiconductors (such as β） Wait.

A multimeter alone is not enough. It must have a transverse load. For example, if you want to know the actual capacity of a 20Ah battery, you need to discharge it at a current of 1C (20A) for 1 hour. If it can discharge for 1 hour, it means it is qualified, but it cannot indicate that the capacity is insufficient. But remember that the smaller the discharge current, the greater the capacity released. All power batteries are marked with 1C as the standard discharge.

1. Search for "Lithium Battery Capacity Test" on Taobao, and it's easy to test a 30-40 board!

2. First, fully charge to 4.2V, then discharge the electronic load to 3V with constant current, set the current to 0.5A (approximately), record the discharge duration, let it sit for two hours, it will be 1Ah, and so on, the capacity!

The battery capacity is generally expressed in mAh milliampere hour, and 1mAh is expressed as 1 milliampere current discharge for 1 hour

two

The total capacity of the battery is expressed in C

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Steps/Methods

Fully charge the battery, and the voltage of a single lithium battery after being fully charged is 4.2V;

Use a multimeter to discharge the battery at a constant current (0.5C, relative to battery capacity) and set the termination voltage to 3V;

Multiplying the discharge current by the time of constant current discharge is the battery capacity;

Inspection: If the constant current discharge cannot reach two hours, then the nominal voltage is not enough. There is a possibility of counterfeit and inferior batteries.

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matters needing attention

The capacity test is based on the parameters of full charge voltage and the set termination voltage, because the minimum discharge voltage of lithium batteries is 2.75V, a voltage less than 3V is no longer meaningful for lithium battery testing;

The fixed current discharge is generally expressed as how much C is used, and lithium batteries are generally tested with a discharge of 0.5C.

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