Disclaimer: Charging LiPo / Li-Ion batteries is dangerous! Better use a comercial professional charger. If you choose to build the charger described here, use it at your own risk.
To charge a LiPo / Li-Ion cell, it is supplied with constant current until it reaches 4.2V (depends on cell, usually 4.2V). This is what the circuit does: the current is limited to 0.7/Rc, where 0.7 is the Vbe of BC337, and the voltage limit is adjustable from the potentiometer (with a voltmeter connected instead of battery). LED1 indicates if the battery polarity is OK. LED2 indicates if the battery is charged. The transistor D882 dissipates the unused power, so it needs a radiator. It is a good idea to place the transistors close to each other, because at high temperature the Vbe of BC337 will decrease, so the current will decrease. The diode is used for protecting the circuit from reverse polarity of the cell. Almost any high-current diode can be used.
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