Simple Battery Level Indicator

Description

Here is a easy to build low battery level indicator circuit that produces a visible indication by flashing a LED when the battery voltage drops below a predetermined voltage.The circuit is based on Panasonic’s  IC MN13811G   and a efficient flasher based on transistors Q1&Q2.Here when the battery voltage drops below 2.4  V the output of the IC is activated and the flasher starts flashing.This circuit here is an ideal one for monitoring the level of all types of 3V batteries.The circuit is power efficient with a  idle current drawing as less as 1 uA  , and a current drawing while flashing as less as 20uA.

Circuit Diagram with Parts list .

Low Battery Level Indicator
Battery Level Indicator Circuit Diagram

Notes.

Assemble the circuit on a good quality PCB or common board.

Do not keep the soldering iron tip on the IC’s pins for long time.

IC MN13811  series are available with different trip point voltages( from 2.4V t0 4.8V) ie MN13811G to MN13811U .If you need a trip point other than 2.4 shown here, you can choose the corresponding IC from the data sheet  and use it in the circuit here.

We have more Battery Circuits that you may like to take a look;

1. Voltmeter Circuit using LED

2. Lead Acid Battery Charger Circuit

3. Ni Cd Battery Charger Circuit

4. Simple Battery Charger Circuit

5. SMF Battery Charger

 

Author

21 Comments

  1. Dear admin can we increase it’s capacity to measure the voltage drop for example can it work for 12 volts battery if yes then which components needs to be replaced any answer would be appreciated thanks

  2. tell me about distributors of ic MN13811G in India (Maharashtra).plz reply fast as early as possible.

  3. I thanks a lot for visisting your site can i kwon the objecti ves of simple battery indicator

    • Hi . Assemble the circuit on a good quality PCB or common board.
      Do not keep the soldering iron tip on the IC’s pins for long time.
      IC MN13811 series are available with different trip point voltages( from 2.4V t0 4.8V) ie MN13811G to MN13811U .If you need a trip point other than 2.4 shown here, you can choose the corresponding IC from the data sheet and use it in the circuit here.

  4. Sir,I want lead acid battery(tubular battery 100 AH) charging level indicator circuit diagram.(ACCURACY level indication)
    Thank you in advance.

  5. THANKS A BILLION. THE CIRCUIT SCHEMATIC WAS A STITCH IN TIME THAT SAVED 99 OTHER STITCHES. 5 AND HALF THUMBS UP FOR YOU. COULD YOU HELP ME WITH A 5000W INVERTER CIRCUIT. WOULD BE GLAD AND GRATEFUL IF YOU COULD.

  6. if the voltage was down, then led flashing? how if battery while charging, which led will lighting when it full? my battery is 4 volt, i’m in indonesia. tq

  7. Hello,

    Thanks for sharing the above circuit…

    How can the above circuit be used to monitor 6V or 12V Battery. What modifications are necessary.

    Thanks
    Dev

    • hello. even i want a battery level indicator circuit that can be used for a 6V battery.. please help me…really urgent..
      thank you

Write A Comment