Auto Cut off 12V Battery Charger Circuit diagram - Simple Electronic Project





Diagram of 12V Battery Charging & Auto cut Circuit


Components Needed for this Project:

You can get the components from any of the sites below:

  1. LM324 Voltage Regulator [See Buy Click Amazon]
  2. 3V Zener Diode [See Buy Click Amazon]
  3. 1N4007 Doide [See Buy Click Amazon]
  4. 3v Buzzer [See Buy Click Amazon]
  5. LED 5mm [See Buy Click Amazon]
  6. 5 Pin Relay [See Buy Click Amazon]
  7. 1k Ohm Resistor [See Buy Click Amazon]
  8. 10k Ohm Resistor [See Buy Click Amazon]
  9. 100 Ohm Resistor [See Buy Click Amazon]
  10. 2.2k Ohm Resistor [See Buy Click Amazon]
  11. 10k Ohm Varible Resistor [See Buy Click Amazon]
  12. BC547 Transistor [See Buy Click Amazon]

*Please note: These are affiliate links. I may make a commission if you buy the components through these links. I would appreciate your support in this way!

Related Basic Electronic Mini Project Circuit Diagram:


Working Principle




Frequently asked questions

At what voltage is A 12V battery overcharged?

When the vehicle is started, without the introduction of a load (the lights, ceiling fan, or air conditioner), the volts will usually rise to an average of 14v. If the multimeter reads at more than 14.8v, then this can be considered an overcharging system.

What is the normal charging time?

But in general, it can take anywhere from 30 min to 1.5 hours to fully charge your Android smartphone, depending on the 12V battery capacity of your device. The larger the capacity, the longer it takes to charge the system.

Is 13.2 volts good for a battery?

When a deep cycle battery is fully charged, it typically reaches a voltage of around 12.6 to 12.8 volts. However, the voltage can temporarily rise to around 13.2v during the charging process unit. As long as the voltage doesn't consistently exceed 13.8 volts, it should not be a cause for concern for battery Health.

Is 14.8 volts too high for a battery?

For standard passenger vehicle 12v systems, anything above 14.8v is worrisome. Anything below 13.6v will not adequately charge the battery charging voltage of 15V.

Is 13.6 battery voltage good?

A 13.6V reading at rest would indicate a newer, fully charged lithium iron phosphate battery 12V battery. while older units might read 13.5V. As soon as they have any draw at all, this Fig (Circuit diagram) falls away quickly. A 99% charged battery will read 13.4V, and a 93% charged battery will read 13.3V battery level.

Related Articles