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1. Over discharge protection: When the polymer lithium-ion battery is about to run out of battery power and the voltage reaches a required minimum value, the protection board will close and cannot discharge anymore. As a result, the product will automatically shut down, forming a type of over discharge protection.

2. Overcharge protection: When charging polymer lithium-ion battery products, when the voltage reaches the highest voltage (4.2V), the protection board will automatically power off and close, indicating that it is fully charged and will no longer continue to charge. A type of overshoot protection function formed.

3. Short circuit protection: When a polymer lithium-ion battery accidentally short circuits, the protection board will automatically close within a few milliseconds and will not be powered on. At this time, even if the positive and negative poles touch each other, it is fine, forming a short circuit protection that will not cause an explosion event.

4. Overcurrent protection: When the polymer lithium-ion battery is discharged, the protection board will have a maximum limiting current, which is different for different products. When the discharge exceeds this current, the protection board will also automatically close.

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