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 .
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.
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21 Comments
Hi there. Is there any alternative for IC MN13811g ?
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
tell me about distributors of ic MN13811G in India (Maharashtra).plz reply fast as early as possible.
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.
Sir,I want lead acid battery(tubular battery 100 AH) charging level indicator circuit diagram.(ACCURACY level indication)
Thank you in advance.
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.
Dear Sir,
I am looking 500watt UPS circuit.
please reply immidiately.
I just love it,because from few days i searching such a circuit project and now i find it!
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
Hi Seetharaman i cant get the IC MN13811G in mumbai so can u give me a substitute
hi i am from india i am not getting IC MN13811G
give me substitude
Hi Raj MN13811 G is rated for detecting Less than 2.4 volt level. for other levels suffix C to U are available in different ranges (2 volt to 4.8 volt) refer datasheet
http://pdf1.alldatasheet.com/datasheet-pdf/view/14242/PANASONIC/MN13811-R.html
Can i use this circuit to monitor the 3.7 V Lithum ion battery..Thanks
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
HELLO MR I ALSO WANT A 500W UPS CIRCUIT PL MAIL ME THE ONE
Dear Sir,
I am looking 500watt UPS circuit.
please reply immidiately.
B.regard
Ms.Sami Mustafa
T.director
i will work on it
you can expect the circuit soon