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The charger charges the battery with a constant current, and as the battery voltage increases, the charger also increases the charging voltage to accelerate the charging speed.

When the lithium battery reaches the cut-off voltage of 4.2V, the battery only charges about 70% of its capacity (not fully charged). At this point, the charger continues to charge the battery with a constant voltage and gradually decreasing current. When the value is less than 0.1A and the battery voltage continues to rise, it stops charging.

When charging lithium iron phosphate batteries and related products, it is best to choose the original dedicated charger. Because the original charger is the most suitable for voltage, charging speed, and is also the least likely to cause damage to the battery.

1. Some mobile phone chargers themselves are protected and stop charging when the voltage of the lithium-ion battery pack reaches 4.2 volts. My idea is to connect a slightly higher power silicon diode (with a forward voltage drop of about 0.6 volts) in series between the lithium-ion iron phosphate battery pack and the charger. When the voltage of the lithium-ion iron phosphate battery reaches 3.6 volts, the diode voltage drop is exactly 4.2 volts, It can also be detected by the charger and stopped charging.

2. The protective circuit of the mobile phone battery is removed and used for charging protection of the lithium iron phosphate battery pack. According to the above principle, a diode is connected in series during charging to provide 4.2V protection.

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