How To Build Your Own 18650 Li-Ion Cell Charger

In this video I show how to build your own simple DIY charger for Li-Ion (Li-Pol) batteries using parts of a dodgy Chinese charger. It works with 18650 and AA sized cells. The Chinese Li-Ion chargers are very cheap ($1 - $2 including shipping), but their power supplies are often dangerous. So it may be a good idea to remove the questionable internal power supply and hook it to a safe external power supply of 5V. USB phone chargers are probably the most suitable sources of 5V power.
WARNING: Mains voltage is dangerous. Risk of electric shock and death. Li-Ion / Li-Pol batteries can explode or cause fire. You are doing everything at your own risk.
You can support me on Patreon:
/ diodegonewild

[@Creativecreator]

Really man I am highly curious about your videos your English is different from other people and also very easy understandable Like your videos very much.

[@Wagna87]

I love this guy! Pretty funny to listen. So being said I like this video.

[@jasonlogan5765]

like the chef in the mupets

[@deankay4434]

Yes, Turr-do Tuur-doof ump to umpa Tuur-doo! Has it moowed, i dink so moouch morri dan i thinked! Wa-La! TaDaaa!

[@Mylity66]

Fantastic, this is going to breathe new life into my father's old electric screwdriver (Black & Decker Powerdriver 9074 type 1, i can't even find when it was made, probably nearing 30 years by now). It's old Ni-Cd battery pack died off when i was a child and sat in a box for years until i hacked a 5v wall wart into it as a teenager (just tossed the batteries and soldered the cables to the terminals), it wasn't wireless anymore but it's been working for almost a decade just fine and my father loves it, recently however, i realized a li-ion cell would sit perfectly in the battery space of this thing but i didn't knew how to charge it without having to remove the battery to place it in a charger, so looking around i stumbled with your video. I'm sure i can scavenge the parts from the secondary on that circuit to build it myself, no need to even buy one of these chargers. Thank you very much, the best part is that i get to reuse the wall wart... again. :)

[@keithking1985]

Very cool fix

[@menadabdarazak1762]

I watch your videos every night and i like your effors in explinations and schematic and i love when you say dengerouuuuse ;)

[@filenotfound__3871]

I made my own Li-Ion USB charger by connecting 2 diodes with a voltage drop of 450mV in series and a current limiting resistor, works fine, but is it safe?

[@dunderdee]

battery overcharges ur house no more

[@German_byte]

I love his cavalier contempt for some items as he tosses them aside 😂

[@MIW_Renegade]

That was really interesting I watched this about 5 times while building this myself

[@therealjammit]

This won't protect against two batteries connected against (+ to -) each other, but adding a few ohms of resistance in series with each battery would prevent the self high current charge/discharge from happening. Unfortunately it would take even longer to charge and the charging LED will probably claim fully charged before it really is. Wouldn't be too bad if you leave the batteries trickle charging continuously.

[@ytrew9717]

4:28 the way you stripped the wires with a simple cutting wire is simply amazing! How do you do that!?? I'm using an utility knife and a plier, and it takes a while!). Please upload a video about it!

[@nonamedelete9132]

It's skill bro u'll get it after using your pliers for a while. I can do it with scissors, knife and whatever cuts. My point is, you have to feel it. You can't teach it via video. Good luck stripping! (oops that wasn't sound good)

[@VOLTRONDEFENDER4440]

You can get a wire stripper

[@AllLoudNation365]

​@@nonamedelete9132 lol

[@butth0le_inspector]

5:15 - I think you shouldn't blow your solder while it solidifies because that could contribute to it to become a cold solder (bad joint).

[@Lukas-gp5rv]

Why should it?

[@nikiamz6501]

The USB chargers (5v 1a) have short circuit protection

[@amicklich6729]

Great video. I intend to make this mod on mine for safety. I enjoy your practical, entertaining videos!

[@donaldhenke2750]

i love your vids.... thank you....Donnie..... thanks.

[@robertgaines-tulsa]

Dangeroos?

[@JUANKERR2000]

Any relation to kangaroos?

[@vaclavtrpisovsky]

@@JUANKERR2000 Possibly; he spent 6 months in Australia 2 years prior to filming this video.

[@dunstan96]

Excellent video - thank you. I bought a Canon Ixus camera without a charger. I have a battery charger for a Sony Cybershot camera which I would like to modify to charge the Canon battery. Do you have any advice?

[@BomJimmy]

Try better high current USB adaptor to charge it faster.

[@RixtronixLAB]

Nice video, well done, thank you for letting us know :)

[@suavemich7700]

any need maybe for a 5v zener across the input lines in case the charger over volt the charging circuit? And what about a improvement like a low esr over the standard cap.

[@hmoudkhresheh1979]

Please can u till me what is the type of IC in the charging side

[@ogam123]

You coul use a custom pcb or sot23-5 adapter on a perfboard with the mcp73831 battery management chip

[@hnzwhrms]

In this schematic figure, The assignment of IC's pin 5-8 is wrong ! The pin 5 and 6 are grounded. The pin 7 is connected to a battery (+) and the pin 8 is connected to +Vcc.

[@gameboy8956]

absolute wrong.. pin 1 is bat. negative and pin 7 is bat. cathode

[@jeanmarc622]

Hello, what a good idea,I didn't know what to do with them. thanks for all your videos

[@enriquesalgadoaceves9017]

Great video , I have a question, my diode is 1N4006 , and I'm charging an 18650 battery bank, I inserted the microusb cable and in between the the cable and the solar input, I have the diode, do you think the diode is strong enough for a battery bank or which one would you recommend?

[@EdiNaumov]

I just made the mod following your video, is it possible to increase the charging current to something like 1 amp? Charging with 0.3 amps is actually really slow.

[@keithking1985]

Yes look up the data sheet of the chip usually its just a matter of swapping a resistor but you can also change the capacitor to a larger one to give more current.

[@SportStream2015]

this is possible to change this electronic with the tp4056 this is safe to modify i have litokalla and two generic charger but one is moding with this electronic

[@AverageJoe2020]

Nice explanation of an easy adaptation, Though I would not trust most people with using, a spoon safely, let alone a soldering iron, J.

[@danijel124]

This is a great idea :) those cheap chargers just became usefull ;)

[@melplishka5978]

Awesome idea. Well done.

[@bennsji1]

Great Video thanks for your explanation ....

[@mwint1982]

Excellent as usual

[@amperak]

dáš dvě pojistky na výstup, každej článek jednu a je to sejf

[@madrian_hello]

Very good channel, I saw áll your videós. Oh yes, the good old czech soldering iron.

[@singingzone3056]

Nice... Deepak Kumar from India

[@DharmeshTechZone]

This modified has automatic over voltage protection??

[@NanoMine]

What do you mean by overvoltage protection? Do you mean it on input side or output side?

[@DharmeshTechZone]

There is a auto cuttoff when battery is full charge??

[@bobbyredublaregero9263]

@@DharmeshTechZone you're right...

[@Ganafutbol]

There's a error on 3582 chip pins. , Inverter ,,. Pin 1 Is. Bat out -. Check please

[@chadgrimes5119]

It charges the battery in parallel not separately.

[@pierreuntel1970]

ahh... bobby trap with those swappable polarity, even though the chip have polarity detection but if you connect 2 battery with different direction then it will melt down

[@DiodeGoneWild]

Yes, it's a trap. They try to save money, so they use just one chip. People can easily put the batteries in different directions, as they are used to it with AA batteries. It's better to use just a single cell charger. Or maybe somehow put a second chip into it.

[@theirisheditor]

One fix - add one more 1A fuse between the two slots. ;-)

[@SianaGearz]

Another trap: when you put two cells in that haven't been used all the way together in parallel and are at a different voltage, a high compensation current will flow, as one battery will charge another, with a decent enough likelihood of unpleasant consequences.

[@gyd104]

Will the battery explode

[@albysHub2006]

Thank you it works really well!

[@Belissimo-T]

Are you crazy? You are using 5V to charge a 4.2V Cell. Or has the chip some kind of voltage regulation?

[@keithking1985]

Yes it steps the voltage down and cuts off at 4.1v I think it said on the label. This guy wouldn't make that mistake either so easily he's fairly on the ball. Anyway that's the voltage that the transformer he replaced was ment to be supplying but it was "doodgee" in his words.

[@webocoli]

Very clear - Thanks!

[@1959Berre]

Wonderful accent. "All these animals are dangeroos".

[@NEONETIES]

Chinese charger always doesn't showed the Positive and negative pin! ⚠️🙈 And your mp3 player maybe just need to replace the oled display and battery!

[@sammy-pp1gl]

Hi , I have some 136850 batteries . I tried to fix it with my new charger which i ordered from ebay . all fixed but it,s not charging ,what could be the reason ,is the charger not suitable for this battery or could be other reason ,can any one help me

[@mrblack9583]

Great video

[@gyd104]

The battery will exploded or not

[@robertastracevskis5342]

Gow Gow Please learn english ur question was Will the Battery explode?

[@em0_tion]

This is my siiiiiiiiiiiiiiiiiiiiiiiiister 😆😁

[@linuxuser2858]

Learned some electronic....... thanks

[@Pseudoplasmagore]

Do you like Arch Linux?

[@phorzer32]

You haven't added the fuses ;-)

[@ashwinhirani6768]

Very nice sar

[@tulavy_pistik]

Ja som použil TP4056 a k tomu 18650 držiak a funguje

[@jdmfl26]

Da se tp4056 použít na dvě 18650tky?

[@sharukhmatekuki5830]

Nice 👍🏻👍🏻 🇮🇳 || Kuki 14|01|2022

[@Thomaspoa]

Does anyone know what size fuse to use?

[@alibehrouz9833]

what do yo mean about "dodgy"?

[@mwint1982]

Means your ass is getting zapped

[@channelsixtysix066]

That plug really is a piece of shit. Mate you're a laugh. So pleased to find your channel. 😆👍

[@akaishi1583]

I swear your soldering gun was white before...

[@DiodeGoneWild]

I have a white one, a blue one and an orange one :).

[@MIW_Renegade]

DiodeGoneWild nice I have a black and red one

[@norvinsakiral4450]

Nice video..

[@Uraim]

the dodgy adapter makes the charger more dodgy :')

[@jitendrakumar-ni4ys]

5v for 3.7 li ion battery???

[@albysHub2006]

yea but than the chip will regulate the output to 4.2v

[@DavidMG99]

Thanks man! 👍👍👍👍

[@zx8401ztv]

Now that's the way they should of made it :-D Safe and runs off any 5v supply. The chip should not get too hot as it will only have roughly 2v drop across it with a flat battery :-D

[@mrjohhhnnnyyy5797]

zx8401ztv It's still 600mW, which is the limit of the most IC's in the dip-8 package. It's not like tp4056 boards, where the ic has a thermal pad to transfer heat to the board.

[@mrjohhhnnnyyy5797]

zx8401ztv Yeah, I know that I ruin every conversation I barge in :D

[@zx8401ztv]

MrJohhhnnnyy, Thanks for telling me off lol :-D I did say "Roughly" i didnt say any exact value, as that evil Mr johhhnnnyy will correct me with a big hammer LOL :-D Im only playing with you :)

[@zx8401ztv]

No you dont, you are eager to correct that evil english man He he :-D :-D

[@mrjohhhnnnyyy5797]

zx8401ztv What I like to do in such situations is to add a resistor in series with the supply. Value depends on the current, for this one a 1Ohm resistor in the supply will decrease the dissipation on the chip to 0.51W, which is a 15% decrease. The charge chips usually operate fine down to 4.5v, so you can choose the resistor which will drop that amount.

[@robertastracevskis5342]

Hey owner of the channel can u post me a schematic fot this charger or make a video for a diy charger thanks if u read this and answear.

[@indra-fu1ew]

Cancerish he did in this video

[@romikajol4376]

পাওয়ার ব্যান্ড চারজার দিয়ে তৈরি করা যায় না

[@almaryngksai1035]

Dangeruuuus!!!!!

[@yurigagarin4974]

cool idea😎👍🇬🇧

[@delosslance5258]

Oh & Thaaaiinka EuuuuA ! What is the origin of language ? Just curious, because the transition from higooe to English has GOT TO BE the worst sound . If this was as advertised I'd turn volume down . I have an unbelievable tolerance for everything but the vocal up pitch at the end of 90% of sentences hurts my dead skin cells . I'm sure you're an amazing guy & SUPER intelligent but use subtitles

[@MIW_Renegade]

Wow 11 hours old and only 28 comments (29 with mine

[@amaanqureshi1286]

Use a tp4056 ffs it's under a dollar

[@robertastracevskis5342]

light tree I would just send it to me in few days and not a month

[@doriantech9064]

But rather, USB-powered LI-LON BATTEY CHARGER.

[@chiragjiyani7056]

Good

[@Ganafutbol]

Ser 3582 's. Pdf

[@aadiram_ousana6192]

I like thiis thank youuuu

[@delosslance5258]

Okay , I'm frustrated with the endless searching about HOW TO CHARGE LITHIUM ION BATTERY WITHOUT A CHARGER !!! I SPECIFICALLY enter those words into all search engines & after 3.5 hours NOTHING !? No "How to make one" or "How to charge any Lithium ion with the particular battery you want to charge WITHOUT CHARGER & here's how to do it ." I'm on the 400th click & video with no help . Is this video False Advertising ? I'm watching ching this and thinking "FINALLY" but then this guy whips out a CHARGER !?!?!?! NO MAN ! THAT'S A CHARGER modification ! I DOMT HAVE A FU**ING CHARGER !!! Oh my goodness . If I had ANY form of charger I'd be able to modify it . DON'T CLAIM TO RECHARGE A BATTERY WITHOUT A CHARGER , THEN PULL OUT A DA*N CHARGER !

[@MohamedElHanoun]

😁 Ur Unique

[@mhhchannel]

Youre indian or englishman?

[@Pseudoplasmagore]

Czech

[@Purple431]

Original charger DODGY!

[@tomasdecker8355]

Lets oupn it ferst. :D

[@ابومحمدالميساني-ر2ج]

👍👍👍👍👍👍👍👍

[@SamsungJ-wo4jb]

Jangan dibuang bang bagal sayaaja bng bng

[@SamsungJ-wo4jb]

Keren

[@michaelwaweru4593]

Day..nja..roos

[@electronmath8609]

👍❤️

[@romikajol4376]

এখনি ভিডিও চাই

[@markboldyrev8321]

5 more subscribers to go!

[@DiodeGoneWild]

I just took a look and saw 9999 :D

[@aigleblanc3966]

Oui oui tu chante bien combien on te paye pour cette vidéo hi yes allez stop stop oki

[@mechanicalmanny494]

Indian , Italian, Russian ( fake)

[@robertastracevskis5342]

Mechanical Manny Well im kinda russian and i do not jnderstand what did you say.

[@jasonlogan5765]

i have that same charger and i was going to do this fix to it but its not the same inside is it cuz im in the u.s.a.