Auto cut off 3.7 volt battery charger circuit

#18650batterycharger
#lithiumbattery
#batterycharger
#3.7v_battery_charger
#18650
3.7v battery charger circuit with auto cut off
3.7v battery charger circuit diagram
3.7 volt battery charger automatic
Automatic 3.7 volt battery charger circuit
18650 battery charger with auto cutoff
3.7v battery full charge indicator
3.7v battery protection circuit
In this video i'm showing how to make 3.7 volt battery charger circuit with auto cut off on Full Charge.
For that i used TL431 Shunt Regulator, it's actually a adjustable zener.
I used mosfet which remains on by supplying small positive voltage using 1k resistor.
And cut off voltage is set at reference pin1 of TL431 by using resistors from both positive & negative.
When voltage in circuit reaches to threshold point TL431 connects negative voltage from pin2 to pin3 so positive voltage at mosfet gate pin becomes zero and Mosfet turns off.
👉 Download Circuit Diagram Link
drive.google.com/file/d/1C-NG...
Join Group: / 819126578700997
Follow Page: / creativetechvids
PART LIST
Irfz44n Mosfet
TL431 Shunt Regulator
2x 4.7k Resistors
1k Resistor
15k Resistor
5.6k Resistor
220 ohms Resistor
Red & Green Led (5mm)
Crocodile clip wires
Battery Holder
Thanks for watching...

[@CreativeTechos]

👉 Circuit Diagram Download Link in Description

[@tnamen1307]

can this be replicated for laptop battery ????

[@Timerkhan]

@@tnamen1307 No.

[@CreativeTechos]

You mean for 3 s battery?

[@tnamen1307]

@@CreativeTechos please make circuit for laptop auto off charger.

[@Timerkhan]

@@tnamen1307 If you want to charge the laptop battery outside the laptop, then you need to use a charger with balancers. Moreover, the number of balancers should be equal to the number of batteries connected in series in the battery.

[@HannTheftAudio]

Thank you for the tutorial. I'm impressed to find someone actually talking in the tutorial. it made following along that much easier when someone is actually telling us what to do instead of just doing it and expecting us to know what they are doing. again thank you

[@CreativeTechos]

You're most welcome ☺️

[@sathananthans]

Very calm and clear explanation with demonstration is very appreciable. Even an untrained person could do this from your video. Actually this is the way of good teaching that everybody can understand. Thank you for an excellent video.

[@CreativeTechos]

Thanks for appreciating, Thanks for watching 🙂

[@toto6toto]

Thank you! I needed this!

[@johnpap7299]

Greetings from Greece. Simple analog circuit and effective, many people knows electronics but in practice you take +1.0000 my friend. I believe that theory can not do nothing if the practice is not follow. Thank you and congratulations.

[@CreativeTechos]

Thankyou so much for appreciating

[@eugenekolesar5412]

Very through, clear, precise excellent description

[@CreativeTechos]

Thankyou

[@joeelias2515]

I admire your works and projects with a high sense of respect and many times learn from them as well but may I point out a fact which I think is very important with regards to the circuit diagram shown from 2:33 to 2:36,the green diode is shown connected the wrong way,I think a circuit built in this manner will not work properly because the green diode should have been connected the other way round with the positive pin(which is pin 2) soldered to the positive supply line through the 5.6K resistor.I STAND TO BE CORRECTED ANY WAY, thanks.

[@CreativeTechos]

Yes i apologise there is mistakes in diagram, but i have already updated and corrected the mistakes and the perfect diagram download link is in description.

[@josejuanmandujano8118]

Saludos cordiales desde Querétaro Querétaro México ! Gracias amigo!!

[@valtersouzaribeiroribeiro9534]

Parabéns pelo seu trabalho bom bom

[@CreativeTechos]

Thankyou

[@jlucasound]

Awesome circuit! Thanks! Subbed.

[@CreativeTechos]

Thankyou for appreciating 🙂

[@GIOVANNADUESPINOSA]

Congratulations, great job. Success always !!

[@CreativeTechos]

Thankyou so much 😍

[@MustafaGARGI]

Very useful circuit and I tried it. It indeed cuts the voltage when the battery is full but as long as the circuit is connected to the battery red led remains lit.

[@omodeindemustopha9270]

This is something that bothers me. It'll be draining the battery. Or is there anyway one can do it?

[@vjf1221]

not sure why red led would remain lit as i haven't tested the circuit, but if you are concerned about green led draining the battery you can disconnect it. the red led should go out when the battery is charged.@@omodeindemustopha9270

[@stevemiller5214]

It's like you read my mind, the video was just in time for my for my project! Thanks 😊 I'm going to try making this circuit I'll let you guys know how it works

[@CreativeTechos]

Let me know if any help needed 👍

[@sharangakoch3546]

@@CreativeTechos PP

[@lazy-hero.]

Is it working well?

[@CreativeTechos]

Yes it works and use 5v 1A charger

[@TPE3BAK]

За стерильность спасибо!

[@kronostico]

Very nice and clear. Thank you!!!

[@CreativeTechos]

Thanks for watching 🙂

[@outlawrebel4209]

Thank you for all your videos. Very informative and helpful. One question, can the 431 shunt regulator be substituted with another type of regulator? Or something equivalent to?

[@CreativeTechos]

In simple words TL431 is an adjustable zener diode, so there is broadly available in market with TL431, KA431 or KA431AZ both are same.

[@Seekerofthegrail]

These is more interesting. Those posting technical projects here should take example from this tutorial. Using English to explain for the understanding of subscribers is the ultimate. Thanks 👍👍👍👍👍

[@jaimaorpy4628]

really a very useful project, sir.

[@CreativeTechos]

Thanks

[@dadangsyadzeli3692]

thanks for the knowledge my friend

[@CreativeTechos]

You're most welcome

[@MarianCobirlie]

Thanks for diagram !

[@CreativeTechos]

You're most welcome 😉

[@Aleksandr8229]

Спасибо было интересно! В принципе можно сделать под любой вольтаж.

[@elyaabe.inventions]

Your work is very good, I wish you success in the following and thank you for this information. Thank you

[@CreativeTechos]

Thanks for watching 🙂

[@sushilchoudhary5749]

Very very thanks for informative video.

[@CreativeTechos]

You're most welcome 🙂

[@rajendranparakkal7335]

very Good circuit .your voice is very super.Thanks sir

[@CreativeTechos]

Thanks for appreciating

[@user-kz4pe5nd1f]

احسنت ستاذ 👍🥀🌷💐👏🙋‍♂️💝💕🌺🌹

[@CreativeTechos]

Thanks for your support ☺️

[@punithminocha2875]

Great job👍 do make circuits for more than one battery, like charging 2 or 4 at one time with a suitable adopter rather than power bank

[@CreativeTechos]

I'll soon upload 3s bms with auto cutoff and input can be taken from any adopter like of laptop

[@Mkhayra]

@@CreativeTechos I cant wait!!! Great job

[@mychannal7396]

Video is Easy to understand. Very good

[@CreativeTechos]

Thanks for watching 🙂

[@taikong7952]

Thank you, wish you well

[@CreativeTechos]

You're most welcome ☺️

[@BaiKreasi12]

Thank you brother🙂

[@CreativeTechos]

You're most welcome

[@rubenporrasm.6199]

Thanks for such useful circuit

[@CreativeTechos]

My pleasure 🙂

[@kittykidsdoapham3473]

THANKS ❤❤❤

[@jozefnovak7750]

Super!

[@user-bg2vt1qz3k]

1. What is the minimum and maximum input voltage for the circuit? 2. How many watts are the resistors? 3. If you put a tuning resistor to adjust the current (instead of 4.7k + R220), what power should it be? Can I use the 3296 trimmer potentiometer?

[@CreativeTechos]

Current circuit diagram is calibrated for 5v input. And insted of 4.7k + 220R resistors you can use multiturn 10k potentiometer to setup the cutoff threshold.

[@jackson-aka2gs749]

Your videos are great! I will give you a /sub for that. Nice work.

[@CreativeTechos]

Thankyou so much 😍

[@sarehkhan5039]

i'm from indonesia,,,i like your videos brw,,,,mantab👍

[@CreativeTechos]

Thankyou for appreciating

[@chandbasha6345]

This is really very good Thanks you so much

[@CreativeTechos]

Thanks for watching my friend 🙂

[@pitantio3125]

thank you bro this is working very well i have tried it..

[@CreativeTechos]

I'm glad to hear & you're most welcome

[@makathi1234]

Excellent , thanks

[@CreativeTechos]

My pleasure 🙂

[@myohtet3005]

Thank❤

[@danielemencucci9931]

hello,I don't understand the 15k resistor on the red led and the 5.6k resistor on the green led,aren't they too high?were 1k not enough?

[@inmostreign8457]

Good idea!

[@CreativeTechos]

Thanks

[@fabriziodb9024]

I have a question... I already have two leds that are controlled by a micro, so how do I have to conect that circut to the micro so that the micro detect when the batery is in process of charging or is full charged? Is as simple as conecting the input to where the anode of the led might be? or I can take out the leds?

[@Bianchi77]

Nice video, keep it up, thanks :)

[@CreativeTechos]

You're most welcome ☺️

[@joybicar8304]

Thanks for sharing the nice video tutorial

[@CreativeTechos]

Thanks for watching my friend, New version of this circuit is uploaded few days ago, you my check that out too🙂

[@rezatavan5048]

Excellent ❤❤❤

[@GiC7]

Thanks

[@freewolfable]

I enjoyed making this project from your tutorial however I must agree the green diode in the schematic diagram is shown pointing in the wrong direction. I look forward to more interesting projects such as this one was thank you for your presentation.

[@CreativeTechos]

Thanks for appreciating, it was mistake in video but download link in description has correct diagram

[@andrew_koala2974]

You mean the 'diode is reversed' This is the correct terminology. You have not yet learned the language specific to electronics.

[@qnedim3200]

Thanks for the video. I need for lifepo4 charger for 1 cell. Can we limit for 3.65 V . Thank you.

[@djalmaamaro2574]

Hola boa tarde muito bom esse circuito pode me dizer por quê eu montei um com irf 3205 quando eliguei quem acendeu primeiro foi o led verde .

[@diegowilaksana5226]

Thx you

[@CreativeTechos]

My pleasure, Thanks for watching 🙂

[@testedispositivowhiteempty6314]

Bom o circuito ,vou fazer 😃 BRAZIL vendo😉

[@Youtube_free_always]

What is teste dispositivo white?

[@zolkaplijohari7950]

Thanks good idea..

[@CreativeTechos]

You're most welcome

[@sudhirnhavelkar5650]

Thanks sir

[@CreativeTechos]

You're most welcome

[@AmanSingh-wh8tf]

Thank you❤

[@CreativeTechos]

You're welcome 😊

[@romanbadsha9936]

nice❤Thanks🥀🥀💕💞💞💞💞💞💞💞

[@ka-techarastrmac633]

Hi, thanks for your sharings. In circuitry the red led is always on position. What type of diode should we use and where?

[@CreativeTechos]

Please check updated circuit diagram download link is in video description, led position should be in series.

[@user-cb9rd7dc2q]

Hello Thanks for sharing and explanations but unfortunately you have a mistake in the drawing, the practical assembly is correct but different from the drawing you presented. The junction of the two 4.7 kg resistors should connect to the No. 1 (reference) leg of TL431 and not to the Anode and again as shown in the drawing. And the Anode which is the middle leg 2 should be connected to the resistor junction 220 ohms and 15 k ohms Hope you get the comment easily and comment Thank you very much

[@CreativeTechos]

I apologise, but already uploaded correct download link in description.

[@nationc3733]

Can you please upload 3.2V LFP cells charging circuit video.. Thankyou.

[@maximussu7609]

Can the input voltage comes from a 5V 10A power supply. I assume that it draws only the 1 amp it requires right? So we do not need to limit current. Nice video. Subscribed

[@CreativeTechos]

Thankyou for subscribing, also i would like to let you know that you should use 5v 2A charger for 5 batteries in parallel, for 1 battery use just 5v 500ma

[@maximussu7609]

Is it a must or should( just for precaution) because only have high curent power supply tho?

[@mgabrielle2343]

@@maximussu7609 Just use a simple low value power resistor to limit maximum current in series with the power lead, something like 4.7 Ohms 5watt resistor should limit a short circuit current to about 1 amp, protect the circuit as well as the battery.

[@stemtv6421]

Nice!!

[@CreativeTechos]

Thankyou

[@robinrochan9301]

Why you not explain how the circuit is working the video is a soldering course Is important to understanding how the circuit is working? Not solderinf

[@CreativeTechos]

Please check description

[@randomd2146]

The description explains

[@khushishah9368]

Nice project 😊

[@CreativeTechos]

Thanks for watching 🙂

[@kabandajamir9844]

The world's best teacher

[@CreativeTechos]

Thanks for appreciating

[@madhusudangupta3661]

@CreativeTechos, Whether the circuit can take higher input voltage than 5v from usb. What is the input voltage range for the circuit. Can you suggest equivalent for the 431. For parallel charging of more li-ion cells requiring charging current exceeding 1A, whether the same mosfet an be used with appropriate heat sink.

[@CreativeTechos]

Yes this circuit can take 5-24v input, also irfz44n mosfet drain current is rated 44A as per datasheet with good heatsink, I will soon upload adjustable cutoff circuit can that can be used to charge any range of batteries of 5-24v, Also you can use same above circuit for charging upto 5 cells in parallel with good heatsink on mosfet, and using 5A 2A charger

[@madhusudangupta3661]

@@CreativeTechos So many thanks and my heartiest well wishes for your continued renovations and simplified projects. Kindly educate about the use of TL431 shunt regulator. How can it be eliminated with simpler component(s).

[@Timerkhan]

A large voltage cannot be applied to the input of the circuit because the protection circuit that is built into the battery will fail. I do not recommend a power supply voltage higher than 8 Volts.

[@CreativeTechos]

You can apply max input 5v for 3.7v battery, Otherwise it will not fail but will remain in Cutoff state as this circuit is designed when voltage reaches 4.3v it goes in cutoff state.

[@Timerkhan]

@@CreativeTechos In case of poor contact at the terminals of the power supply, "rattling", the MOSFET will open for a while until TL431 gives a "command" to close it. And all the power supply voltage will be applied to the battery. If the supply voltage is approximately higher than 10 Volts, the protection circuit built into the battery will fail.

[@pathankhan7419]

Vury usefull subject sir

[@CreativeTechos]

Thankyou

[@fatihmedhat5739]

👍👍👍

[@onestopcopyright9659]

Bro this is awesome.. please make a vedio on 1.2 volt battery NiMH/Cd.

[@CreativeTechos]

Yes, I'll try to upload ASAP

[@didieralbertoparedeszarago2154]

Súper cool excelent wwwwwoooooooo

[@CreativeTechos]

Thanks

[@user-nk9kt5wf2m]

Thank you.

[@CreativeTechos]

My pleasure Thanks for watching 🙂

[@user-nk9kt5wf2m]

@@CreativeTechos i make this.battary heat and yellow bulb not yet on is it fault ?

[@SatnamSingh-ph2eh]

Good and thanks

[@CreativeTechos]

Thanks for watching my friend 🙂

[@3dmodelinghamid238]

Tnx super

[@CreativeTechos]

You're most welcome ☺️

[@marius-gabrielpopescu675]

Hello ! Interesting and practical. But I have a question; Can it be used for a 3.7V battery in parallel (11Amp)?. I saw the 5v/1Amp source. Thanks

[@batgroupcraft7863]

butiful video.

[@CreativeTechos]

Thankyou

[@icsasziii]

Hello CreativeTechos! Can I have a question please? :) The charging output is 5V-s right, correct?

[@u.s.a3063]

👍👍👍🙏

[@souravbhattacharyya3392]

Superb 👌🙂

[@CreativeTechos]

Thanks 😊

[@khalefaziz2295]

👍👍👍👍👍👍

[@heriheriyanto6524]

So good and easy.

[@CreativeTechos]

Thankyou

[@youdicreator]

Very good 👍👍

[@CreativeTechos]

Thankyou so much

[@narendramankame7967]

Nice explanation sir. How many batteris can be charge at a time.if one ,canyou make batteris charging circuit?

[@CreativeTechos]

Yes, I'll soon upload 3s charging system circuit, subscribe and get notified

[@martinspasov3529]

I have made the same circuit, when the battery is empty at 3.5V I get 0.7A current, and after 4.0 to 4.2V it's constant 0.4A. Is there anyhow I can increse the charge current, because it will take 5-6 hours to charge a 3.7V 2500mah battery. Please helt I need this for my school projekt

[@enriqueatala2567]

Hello and thank you very much for your video, very useful. A question, what modification in the circuit should I do if my battery is 1.5 volts? Greetings

[@CreativeTechos]

1.5v Ni-Cd need different circuit as mosfet will not able to switch in low voltages

[@enriqueatala2567]

@@CreativeTechos of course, my question is what values have will for 1.5 volts?

[@CreativeTechos]

I'll try to upload video for 1.5v ASAP

[@enriqueatala2567]

@@CreativeTechosthank you very much sir. , I am subscribed so I will receive the alert. Greetings

[@CreativeTechos]

Thanks 😊

[@weerasinghaweerasingha690]

Thanks srilanka

[@CreativeTechos]

Thanks for watching 🙂

[@Edmorbus]

Nice work

[@CreativeTechos]

Thankyou

[@Tousifarafat04]

Nice project 👍👍❤❤ but a question,can i use 2 amp charger for charge a 2500 mah battery 🔋??

[@qamarqamar7536]

👍👍👍💓⚘

[@efrenocale5627]

very useful video

[@CreativeTechos]

Thanks 😊

[@ahmadkhalidhotak4348]

How many amphere can this circuit output ?

[@sddfefr5686]

I assembled exactly as in the downloaded scheme. 1. The green diode is off. 2. When the battery is connected, the red diode does not light up. 3. The voltage supplied to the battery is 5 volts. 4. The voltage does not change with a variable resistor (replaced 4.7k + 220 ohms with a 10k variable resistor). Is the circuit not working or do I need to fix something? I will be grateful for help. Thank you.

[@CreativeTechos]

Sorry to hear this, but make sure TL431 ic is worky & mosfet too, also trim pot will not change voltage, you just need to connect variable power supply and set voltage to suppose cutoff at 4.2v, then move the trimpot till green led turns on, Then your circuit is calibrated to cutoff output when it is reach 4.2v, Connect battery first, then plugin the charger, you'll see Red led on, Afterl full charge green will turn on.

[@marklbuctot5040]

Does this circuit works with four 18650 battery connected in parallel with nominal voltage of 3.7V, 3400mah?? Need answers ASAP

[@user-bg2vt1qz3k]

Если поставить подстроечное сопротивление для регулировки тока (вместо 4,7k + R220), то какой оно должно быть мощности? Можно использовать подстроечный резистор 3296? If you put a trimmer resistance to adjust the current (instead of 4.7k + R220), then what power should it be? Can a 3296 Trimming Potentiometer be used?

[@CreativeTechos]

kzbin.info/www/bejne/pKfPgJh6fdCqgZI Check out this video, with adjustable cutoff for any battery, with feedback from battery for precise cutoff. Input voltage should be set cutoff voltage on output + input to output drop voltage.

[@muhammadziaullah6758]

good cct for battery safty

[@CreativeTechos]

Thanks 😊

[@lukmanhakim6308]

Mantabbb

[@enriqueatala2567]

Hello, I tried it with the video circuit (I captured the screen) and it never cut despite not charging anymore and the red led was permanently on, I clarify that I used a new 3.7 battery that was fully charged and I discharged it a little to load. Looking at the circuit in the video with the one in the description there are differences, I used the one in the description and it works fine now. Thank you! I want to make a contribution, I removed the 220 resistor and put a 10k potentiometer as you suggest and you can effectively regulate the charging voltage as a previous user consulted. Greetings.

[@CreativeTechos]

Yes, There was actually led polarity mistake in video diagram, and corrected one is already uploaded download link is in video description, and you did perfect to use 10k pot to adjust cutoff voltage. Thanks for watching 😊

[@enriqueatala2567]

@@CreativeTechos exactly, that was the error of the diagram. Now it works fine, I think, only that I have to adjust the cut-off point according to the battery I am charging, for this I am trying with a 10 kΩ potentiometer. I'll tell you how I'm doing on the tests. A question, I saw a similar circuit of yours that placed a 6Amp diode at the output to the load, is it convenient in this 3.7 volt battery charging circuit?

[@CreativeTechos]

Actually 1A Schottky diode is perfect for 3.7v lithium ion batteries

[@enriqueatala2567]

@@CreativeTechos can be 1n4007?

[@CreativeTechos]

Yes, you can use that too, connect diode on output positive before connecting to battery, to stop reverse discharging, also 4.7k resistor that is connected from pin 1 of tl431 to direct input positive, instead of direct positive connect it to battery positive after diode. It will help to cutoff at precise voltage.

[@parbaz2982]

Will any type of tl431 and irfz44n will work?

[@theroyalfalconking]

Thank you for the Video Tutorial. Very useful. What is the cut off voltage of the above circuit?… Is it 4.2 volt ? Aren’ t I ?

[@CreativeTechos]

Yes 4.2.

[@Accumulator1]

It looked a bit low 4.15. Do I change a resistor so it cut off higher?

[@bijukk4919]

Very good Add low volt cut off posible

[@CreativeTechos]

Thanks ☺️

[@georgekolokotronis9232]

Good evening I saw your post about the 3.7 volt battery I have a 21 volt battery(5 battery 3.7=4.2vx5=21v) Can you tell me what resistors I need to change to make it work Thank you very much

[@faizmomin9658]

Good 👍

[@CreativeTechos]

Thankyou

[@user-bg2vt1qz3k]

Какое минимальное и максимальное входное напряжение для схемы?