1. According to the appearance size, the 18650 battery has a diameter of 18MM and a height of 65MM. You can use a vernier caliper to measure its specific size
2. Visual inspection of its appearance and PVC. , and its quality can determine its quality; However, it is still difficult to tell whether a lithium battery is good or bad just by looking at its appearance. You still need to take real tests
3. Use a. multimeter to measure its voltage. There are many batteries on the market, including lithium cobalt oxide and iron phosphate. Batteries using lithium, lithium manganate and other positive electrode materials have voltages of 3.7V, 3.2V and 3.6V respectively, each with its own voltage. benefits.
4. If you have an internal resistance meter, you can also check the internal resistance.
5. Consumers can also judgeer of the quality of 18650 lithium batteries by the duration of use.
1. Check the label of the 18650 lithium-ion battery to confirm that its output voltage is 3.7V, but the capacity may be higher or lower than 2000mAh (some are 3000mAh)
2. Find the 18650 lithium-ion battery. The positive and negative terminals of the battery, the protruding round button shape of the battery is the positive terminal of the battery, and the flat bottom position is the negative terminal.
3. Use a multimeter to check the output voltage. Make sure it is set to measure voltage. Place the small metal rod at the end of the red cable onto the positive terminal of the 18650 lithium-ion battery. Place the metal rod at the black end of the multimeter onto the negative terminal of the battery.
4. Display the multimeter display panel. If the battery is in normal condition, it should read between 3.6 and 3.7 V. If the reading is below 3.5 V, fully charge the battery. If it is still below 3.5V after charging, that means you need to replace it, as these are signs that the battery charge is slowly diminishing.
5. Check the battery capacity, set the multimeter to measure the amount of current flowing per hour, and place the two metal rods on the positive and negative metal ends of the battery.
6. Check the multimeter display. The mAh of a fully charged 18650 Li-ion battery as labeled indicates that the battery is in good condition.