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my friend shared this circuit which charge 9V rechargeable battery with all protections(Overcurrent, Overvoltage, EMC, etc).
Is this circuit has any disadvantages.
The description doesn't match the circuit. The only clear protection is against reversed battery connection (Q1, R2, D6). I don't recognize current limiting or effective voltage limiting. You also didn't mention the battery type.charge 9V rechargeable battery with all protections(Overcurrent, Overvoltage, EMC, etc)