Please share your feedback on this mini-project and also let me know if you have any queries. The interesting thing of this circuit is that it uses a led that will show the charge of battery by blinking, when you connect a totally discharged battery the LED blink faster but when the battery charging process starts the LED blinking speed will dicrease slowly and completely stop when the battery will fully charged. When the voltage across the battery cross the cut-off voltage, the relay will turn off and the battery will be disconnected from the supply. A good designed circuit of a Alkaline battery charger. Then give the 220V or 110V supply, the green LED will turn on, which indicates the battery is charging. Many 6v battery chargers allow for long-term storage that will not overcharge or boil your battery. Using a superior quality smart charger will extend battery your life and performance. Finally, Auto Cut-Off Battery Charger is readyĬonnect a Lead Acid Battery at the Battery side (as per the circuit.) Most rechargeable 6 volt batteries are neglected and abused because they are installed in applications that receive limited use. Please take proper safety precaution while working with 220V or 110V supply. Then rotate the potentiometer until the red LED turns on.Īfter setting the cut-off voltage disconnect the variable DC supply and connect the step-down transformer at the AC input, as shown in the circuit diagram. Now, to set the cut-off voltage, you have to connect a variable DC power supply at the DC input and connect a multimeter (voltmeter) at the battery side as shown.įor example, to set the cut-off voltage at 13V, you have to give 13V at DC input.