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1. Battery loss performance: The battery voltage does not rise and the capacity decreases. If the voltage at both ends of the 18650 battery is lower than 2.7V or there is no voltage when measured directly with a Voltmeter. Indicates that the battery or battery pack is damaged. The normal voltage is 3.0V~4.2V (usually 3.0V batteries will have a voltage cutoff, 4.2V batteries will have a full charge saturation, and some may have 4.35V).

2. If the battery voltage is lower than 2.7V, you can use a charger (4.2V) to charge the battery. After ten minutes, if the battery voltage rises, you can continue to charge until the charger prompts full charge, and then check the full charge voltage.

3. If the 18650 lithium-ion battery pack is measured and there is no voltage in the battery, there are two situations. One is that the battery was originally good and stored for a long time due to a lack of power. This type of battery has a certain chance of recovery. Generally, a lithium-ion battery pulse activation instrument (lithium-ion battery charging and discharging instrument) is used to charge the battery multiple times in a short period of time, which may be repaired.

4. Check the battery capacity, set a multimeter to measure the amount of current passing through each hour, and place two metal rods on the positive and negative metal terminals of the battery.

Protective board, as the name suggests: a circuit board used for protective purposes. Not only 18650 lithium-ion batteries, but to be precise, all lithium-ion batteries need to be used. It is important to manage the overcharging, discharging, short term protection, and other aspects of the battery as a whole. You are probably the same reason as water and container.

When the faucet is turned on (battery charging), without protection, if the faucet is not turned off, water will continue to flow into the container (charging). When the container cannot be filled, it will still flow in and water will overflow.

We all know that if we don't manage and control the 18650 lithium-ion battery, it will continue to charge, exceeding 4.2V, until it explodes. That's what we call overcharging. Similarly, if the battery is continuously discharged, it will be below 2V. In this case, users cannot afford to charge and the battery will be basically scrapped. However, for professionals, it is still possible to charge at low current, not completely over discharge. If it is discharged to 0V, the lithium-ion battery will be completely scrapped. So there must be overvoltage protection. In addition, there are overcurrent, short term protection, etc.

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