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this video is how to make an auto cut off 3.7 volt battery charger, for the components
1.Relay 6-12 Volt
2.Transistor BC547
3.Resistor 1k
4.Resistor 220 Ohm
5.Vr 10-50k
6.Diode IN4007
7.LED
#AutoCutOffCharger
#Charger18650
#BatteryCharger