In this project, I will show you how to design a simple Battery Level Indicator Circuit using easily available components. Battery level indicator indicates the status of the battery just by glowing LED’s. 

This article explains you how design battery level indicator. So by using this circuit, we can increase the lifetime of battery.

12 Volt Battery Level Indicator Circuit Diagram

Here is a Simple 12 Volt Battery Level Indicator Circuit Diagram. The terminal Voltage of the battery is indicated through a four level LED indicators.

The nominal terminal voltage of a Lead Acid battery is 13.8 volts and that of a Tubular battery is 14.8 volts when fully charged. The LED voltmeter uses four Zener diodes to light the LEDs at the precise breakdown voltage of the Zener diodes. 

Usually the Zener diode requires 1.6 volts in excess than its prescribed value to reach the breakdown threshold level. When the battery holds 13.6 volts or more, all the Zener breakdown and all LEDs light up. 

When the battery is discharged below 10.6 volts, all the LEDs remain dark. So depending on the terminal voltage of the battery, LEDs light up one by one or turns off.

12 volt battery level indicator circuit diagram

How to Make 12 volt battery level indicator circuit watch this video​

Simple Battery Level Indicator Circuit Diagram 3.7 V To 24 V

This is the best circuit for battery level indicator. You can use this circuit with any battery 3.7 V / 4 V / 6 V / 9 V/12 V / 24 V etc.. you can adjust VR1-VR4 according to voltage Level. You use this circuit as a 3.7 volt battery level indicator circuit upto 24 Volt Battery Level Indicator Circuit

3.7 volt Battery Level Indicator Circuit Diagram

How To Adjust VR1 - VR4 for All Types of Battries

9 volt battery level indicator circuit diagram

Parts List

  • IC LM324 1pc
  • Zener Diode 2V or 3V 1pc
  • Resistor R1 10k, VR1-VR4 10K, R2 100ohm to 1K according to Battery
  • LED 4pc Different Colour or Same Colour

How To Make This Battery Level Indicator Circuit Watch This Video

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