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Protective board, as the name suggests: a circuit board used for protective purposes. Not only 18650 lithium-ion batteries, but more accurately, 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 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 fit, it will still flow in and water will overflow.

We all know that 18650 lithium-ion batteries, if not managed and controlled, will continue to charge, exceeding 4.2V, until they explode. It's what we call overcharging. Similarly, if discharged continuously, it will be below 2V. In this case, the user cannot afford to charge the phone, and the battery is basically scrapped. However, for professionals, low current charging is still possible, not completely over discharging. When discharged to 0V, the lithium-ion battery is completely scrapped. So there must be over discharge protection. In addition, there are also overcurrent and short term protection.

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