For the sake of simplicity, I didn’t use a special cross-current circuit. I directly use Rsc to limit the maximum input current Ipk. My Rsc uses a 2W metal film resistor that is about 0.5 ohms. It is about 600mA charging current under 9V input. Too big, next time I have the opportunity to change it again and add a cross-current circuit.
Inductance actually uses 1mH, replace R1 with a 1K resistor + 1K precision adjustable, which can be used to carefully adjust the constant voltage output at 3.65 or 4.2V to adapt to different batteries.
Reference: https://www.utmel.com/components/mc3406 ... out?id=428
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