How to make 3.7v/4.2v battery charger | Auto cut-off battery charger without relay

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Auto cut-off battery charger circuit
3.7V auto cut-off battery charger
4.2V battery charger circuit
Auto cut-off battery charger
lithium ion battery charger

#batterycharger
#autocutoff
#lithiumbattery
#charger
#solderingtech