In order to prevent misoperation, a delay capacitor is usually added to the external circuit. When the battery is discharged and the battery voltage drops to 2.55V, the overdischarge control tube FET 1 turns off and stops supplying power to the load. Over-current protection is to control FET 1 to turn off and stop discharging the load to protect the battery and FET.
Extended data:
Generally, there should be an over-current protector inside the genuine mobile phone battery, which will automatically cut off the circuit in case of excessive current caused by external short circuit to avoid burning or damaging the mobile phone;
Lithium-ion batteries also have overcurrent protection circuits. When using non-standard electrical appliances, the power supply will be automatically cut off if the alternating current is too large, resulting in charging failure. Under normal circumstances, the battery can automatically return to the on state. If, in the process of charging, we find that the battery is seriously hot, smoking or even exploding, it means that the battery must be fake.
If you look carefully, you may find the name of the manufacturer. For example, Motorola battery, its anti-counterfeiting trademark is diamond, which can flash a three-dimensional effect from any angle, while Motorola, original and clearly printed, is genuine. On the contrary, once the color is dim, the three-dimensional sense is insufficient, and the text is blurred, it may be a fake.
Baidu encyclopedia-lithium battery