Smart 18650 li-ion charger circuit with battery full led indicator

Hello friends, today in this video I've shown how to make a precision li-ion charger circuit. The heart of this circuit is the tl431 regulator. You can easily adjust the current by changing the 47ohm resistor, decreasing the resistor value will increase the current. you can use any online tl431 calculator to get your desired voltage. Before connecting to the battery, please check the output voltage first.
Components required for this project:-
1. tl431 regulator
2. d882 transistor
3. 1k ohm resistor
4. 680 ohm resistor
5. 47 ohm resistor
6. led
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[@thePurushTube]

Here is a special warning for those who want to build this circute. This circute is meant to charge a Li-ion battery, and these batteries explode if over charged. therefore its important that circute realibly cuts off when the batery reaches 4.2 volts. In this particular circute, when battery is cut off, the entire base current thru 47 ohm resitor is diverted throuh the green led. But the led can safely take 10 ma only and if overloaded it may burn out, in which case the battery continues to charge with dangerous consequences. Do all testing with no batery or connect a high valuse capacitor in place of battery. 500 ma is too high a charging current. around 200ma is reasonable. Recomended charge current is C/10 means a 1600 maH bater should be charged at 160 ma. For small batteries of say 600 maH it should bejust 60 ma. Ihave written only in the interest of safety as Ihave noted most readers are not so educated in the field and may be unaware of danger.

[@josilvandofelipe7836]

Thank you very much for this information...i dont know this about over charge and explosion of this batery tipe

[@rocio3076]

segun los datos esta bateria se puede cargar hasta un 1amp o mas pero no soy experto en el tema tiene razon con los de el 10%,bueno yo me arme dos 1 con tip 36c 0,55amp y 2do con transitor bd 13005 0,35amp hasta ahora va todo bien a pesar que me alerte este conexta la salida a la base y no logro entender como tiene los 4,2vol

[@rocio3076]

led verde de 3mm utilice estoy esperando q se queme xq note eso q usted dice cuando la carga llega a tope por lo tanto no pasa mas corriente el disipador esta frio por esa razon digo ya q no tome lectura saludo amigo de argentina .

[@adamsucksatyt]

The distorted intro had me laughing :)

[@congha5338]

Hello. Thank you so much for this video. Max current charging I messure is 85mA when I have 4 lithium parallel. May I wrong?

[@bill-zy6dg]

Thank you, you're always a pleasure to learn from.

[@ZAProjects]

great idea friend, thanks for sharing!!

[@user-ty3dp5dw5h]

Тысяча лайков, простой и точный зарядник, при каком токе заряда потребуется теплоотвод на транзисторе?

[@yuriselektro2236]

Thanks,, good job brooo

[@Its-07]

Super sir make 6 volt battery level indicator.

[@karlosarturo4590]

Wow super gracias 👍👍👍

[@sumitnarkhede.3105]

sir tl 431 ki jagah 2n2222 teansistor ya lm 317 laga sakte hai kya.aur is circuit ka output current kitana rahega.agar iske input main 5volt 1amp diya jaye.plese bataye.

[@ashraf61]

Thanks for sharing. ;-)

[@evertek9840]

thanks, SIR,, can i use 2 transistor D882,,, to have( 500ma×2),,output current

[@tharindulakshan9264]

Can i use 5v,2A phone charger to powerup it ....?

[@dhavalpatel4946]

Brother likewise make 6v battery charger please please

[@user-hy3rq1zz7m]

не знаю что но третья рука лайк

[@magoqwerty]

В другом видео есть где он собирает третью руку

Bravo !

[@ShakilKhan-ij4gp]

Is circuit k sath maximum kitne battery ko charge k liye hum connect kr sakte hai. Pls tell me, Than you.

[@AAA-xb8bo]

Sorry Bro,maybe Yellow Cable Output from Emitor,not from Basis..i see yellow output from basis,i see scematic out from Emitor.TrD882(123 ECB).maybe i'm wrong..?1'm Sorry🙏

[@suryapatnaik5720]

In circuit, output is from emmiter, but he connected to base while charging.

[@krishnendusasmal492]

Can i charge a 3.7v li ion battery with it with a 5 volt input. If anything i have to change or not.

[@milat2004]

In the circuit diagram, the li-ion battery positive output is from the emitter of the transistor, but you get the output from the base in the assembly. Which one is right?

[@thePurushTube]

Base is connected to tl431 whch regulates voltage. Notice that the middle terminal of tl431 is the ground.

[@arnbon6241]

Thanks for sharing - keep up the good work.

[@elektronikaelektro8008]

Sir, can i use bd139 instead of b882

[@TECHMASTERVAIBHAV]

First take out the circuit then check the volts of the battery

[@fr.lesvagues3430]

Please, what if i want 8.4v on output? i want to charge 2 cells (7,4v battery} from a 12v adapter

[@TechIdeasAG]

Please use any online tl431 calculator to get components value

[@shyamalkumardolai5030]

I don't get any explanation how dose your circuit diagram work

[@rssm5140]

Okk

[@chesterjohnazman874]

Is it okay to charge multiple battery in parrallel using this circuit?

[@chesterjohnazman874]

Also can i use 5V input voltage?

[@majestic7200]

How do we choose the current limiting resistance for a 6v --- 7 Ah battery

[@thePurushTube]

Yes, choose R47 according to current needed.

[@evertek9840]

hello,, sir,,, i put in place of 680 ohm resistor another 500 ohm,, to have:4,25v,,,,but when i charge the lithium cell the red led goes out,,,, what is the problem,,,,, please help me,,,, thanks

[@gundur7193]

Does the circuit have automatic stop

[@thePurushTube]

Yes battery will stop charging once gren led is lit. Its dangerous to set the voltage at max of 4.2. Otherwise it will explode.

[@safaabekheet7318]

Please, I want to know, what is the output current of this circuit ? Thanks in advance

[@TechIdeasAG]

It depends on the power transistor, here using d882 for 500mA

[@safaabekheet7318]

Ok, Thank you.

[@thePurushTube]

though the statement is correct, that isn'nt the correct answer to the question. You need to choose the resitor(47R in this case) to suite the required current. In any case tD882 can handle up to 500 ma. And power transistore may need heat sink if the input voltage is more. In any case this is the best and safest circuite.

[@arsalankhan5868]

Collector emmiter base ka nahi bataya

[@timeatyou8027]

Can someone (please) explain what's the purpose of every component in this circuit? (All i see is resistors, which limit the amps, to reduce the voltage, but I see a lot. WHY)? And why a 680 ohms? what for?

[@thePurushTube]

the 1k resitor sets the current for voltage divedier and always goes to max of 2.5 V. the current in this case is 2.5 ma and the same current flows thru upper resitor 680. you can change output voltage by changing this 680 ohm resitor remembering new resistor will still carry 2.5 ma. For details of formula see my reply to Mashood Bilal.

[@hyperrunner4589]

What is the charging amps of this circuit

[@thePurushTube]

Set by changing 47R

[@dranyemonaidlasomar2031]

...what is the watts of the resistors???...

[@TechIdeasAG]

1/4w

[@user-gd5ry7fk9w]

🏆👉

[@NP-mx7jw]

Thực tế cao hơn 4,2 v là sao vậy? Tôi làm y như hướng dẫn mà kết quả kg như vậy!!!

[@bensaeed9037]

انا كمان مقاومة الكلكتور في الترانزستور ارتفعت درجة حرارتها وليد البيان احترق والtl ايضا ارتفعت درجة حرارته؟ والخرج كان حوالي 4.9v

[@vocsidientu]

Out + ở chân E

[@vocsidientu]

Bịp vl

[@user-dk1cv2zu3t]

Hi aunts like the experiment did not succeed when the battery is full, the lid does not light

[@thePurushTube]

The out put voltage this circuite is same as the voltage without battery connected. It should never be more than 4.2V. Adjust voltage by changing 680ohm, preferably add a higgh val resitor in parallel.

[@67beppedoc]

47 ohm resistor is not in emitter ( in schematic diagram )

[@thePurushTube]

Yes it controls base current , there by the output. Choose ths as needed.

[@datiev]

Very loud music!

[@TechIdeasAG]

Oops!!!

[@genarorosero5019]

You are misleading your followers, your diagram is different from actual application. Better change your attitude.

[@Ramiltos81]

ВООБЩЕ ТО 5ВОЛЬТ ЗАРЯД ДОЛЖЕН БЫТЬ ЧУВАК! ПЕРЕДЕЛАЙ СХЕМУ. ......