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1. Test using a multimeter with a DC range greater than the rated voltage of the battery. For example, testing dry batteries at 9V and 1.5V using DC10V and DC2V levels.

2. After selecting the gear according to the rated voltage of the battery, connect the probes to the positive and negative terminals of the battery. When the test voltage is greater than or equal to the rated voltage marked on the battery. The battery is intact. When the test voltage is 10% lower than the rated voltage, the battery can be used on appliances with low discharge depth. For example: quartz clocks, remote controls, and other electrical appliances. When the test voltage is 20% below the rated value, the battery has no useful value.

3. It should be noted that the voltage of rechargeable batteries is generally 15% -25% lower than that of similar batteries. For example, the voltage of battery # 5 is 1.5V, while rechargeable batteries are generally only 1.2-1.3V. Therefore, the rated value marked on the battery should be carefully confirmed.

To accurately judge the quality of a battery, it is necessary to use a battery measuring instrument for testing. If you want to quickly and easily determine whether the battery is charged, you can use the method of measuring the terminal voltage of the battery. If the open circuit voltage of a lead-acid battery is less than 12.6V, it means that the battery is dead or broken.

Appearance inspection

Is there any damage or rust on the appearance

Voltage judgment

Test the battery voltage with a multimeter, and the normal voltage is around 3.7V. If the voltage is below 2. If the voltage is 7V, there is a 90% chance that it will be bad

Battery capacity testing

If you have a charger with a capacity display, you can check the actual charging capacity of the battery. Generally, the capacity of 18650 is between 2200-2800mAh. If the displayed capacity is too low, it indicates that the battery has decreased in capacity. If the capacity is too low, it can be basically disposed of as waste

If there is no professional equipment, you can also use resistors, light bulbs, etc. that know the power to calculate the power. The formula for calculating the power of 18650 (taking 2400mAh as an example) is about 3. 7 * 2.4=about 8.88wh

Prepare a multimeter and place the multimeter probes in contact with the positive and negative terminals of the 18650 battery for a simple voltage test. Generally, the voltage of a genuine 18650 iron lithium battery is around 3.20V, while that of a product A's 18650 lithium battery is around 3.8V. A faulty 18650 fake battery is usually low voltage or has no voltage. If it is a fake battery, its voltage output is 0V. Based on the voltage test results, a simple comparison can be made to distinguish the quality of the battery.

Three testing methods to distinguish the quality of 18650 batteries

Three testing methods to distinguish the quality of 18650 batteries

Prepare an internal resistance tester and place the 18650 battery on the internal resistance testing fixture for internal resistance testing. Counterfeit 18650 batteries have no internal resistance or have very small internal resistance values, while the internal resistance of A grade 18650 batteries is generally below 30 milliohms. A simple comparison based on the test internal resistance results can also distinguish the quality of the battery.

Three testing methods to distinguish the quality of 18650 batteries

Three testing methods to distinguish the quality of 18650 batteries

three

If you want to distinguish the quality of batteries more clearly, prepare a battery divider cabinet. After putting the batteries in the cabinet, set the steps and corresponding battery parameters on the specification book for capacity testing. The capacity of product A after divider meets the standards.

Lithium cobalt oxide

The nominal voltage for a single section is generally 3.7V [1]

The charging voltage is generally 4.20V-4.3V/4.35V [2]

The minimum discharge termination voltage is generally 2.75V

Maximum charging termination voltage: 4.20V (new large capacity 18650 models from Sanyo, Samsung, LG, etc. have a charging termination voltage of 4.30V or 4.35V, while Panasonic still has a voltage of 4.20V)

Diameter: 18 ± 0.2mm

Height: 65 ± 0.2mm

Capacity: Up to 3400mAh in 13 years (Panasonic 3400MAH)

At present, the world's largest manufacturers of this type of lithium battery include Sanyo (which has been acquired by Panasonic), Panasonic, Samsung, Sony, and others.

Lithium iron phosphate

The nominal voltage for a single section is generally 3.2V

The charging voltage is generally 3.6V

The minimum discharge termination voltage is generally 2V

Maximum charging termination voltage: 3.65V

Diameter: 18 ± 0.2mm

Height: 65 ± 0.2mm

Capacity: smaller than 18650 of lithium cobalt oxide, commonly 1500mah

Compared to lithium cobalt oxide, lithium iron phosphate has the following advantages:

1: Safer, no explosion or leakage caused by over flushing or over discharging

2: Longer lifespan, capable of cycling more than 1000 times during normal use

3: High magnification, 2C charging and 10C discharging, without overheating, explosion, leakage, and affecting lifespan

However, the lithium iron phosphate version 18650 has a low monomer voltage and is mostly used in high current electrical appliances. The power cylindrical lithium-ion battery is mainly 26650 because it has a larger capacity compared to 18650.

4: Working temperature: -20 ℃ -50 ℃, optimal working temperature is 20 ℃ -40 ℃, similar to the comfortable temperature of the human body

1、 The commonly referred to three cell battery is a battery pack formed by connecting three 18650 cells in series. The final indicated parameter of the battery pack is 11.1V/2200mAh. 11.1V=3.7V × 3, the output current remains unchanged when connected in series.

There is also a voltage drop of 10.8V, which is caused by a voltage drop in a single battery cell, resulting in a decrease in the total voltage.

Most popular netbooks on the market come with this specification battery pack.

2、 There are two types of four cell batteries: four in series and two in series and parallel.

The final indicated parameters for the four series connected battery packs are 14.8V/2200mAh. 14.8V=3.7V × 4, the output current remains unchanged at 2200mA when connected in series.

Two series and two parallel, that is, four battery cells are divided into two groups, connected in series and then connected in parallel. The final marked parameter of the battery pack is 7.4V/4400mAh. 7.4V=3.7V x 2, with an output current of 4400mA=2200mA x 2.

Medium sized laptops (12.1-inch, 13.3-inch, etc.) on the market are mostly equipped with this specification battery pack.

Six cell batteries are generally three in series and two in parallel, meaning that six cells are divided into two groups of three each, and then connected in series before being connected in parallel. The final indicated parameter of the battery pack is 11.1V/4400mAh. 11.1V=3.7V x 3, with a total capacity of 4400mAh=2200mAh x 2.

Some high-end laptops often use six cell batteries.

Of course, there are also batteries with more than six cells, such as those with nine cells.

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