Testing questionable LiPo Battery Charger Schematics I found on the internet!

[@nothingtoseehere4026]

"Hold my beer, while I draw it up". Love the channel.

[@Mijo0x9]

um is that a bomb...

[@NitinKumar82889]

Screenshot

[@Asu01]

GreatScott! "Which of these schematics should I pick?" Donut Science: *exists* GreatScott! "Donut Science it is!"

[@greatscottlab]

I mean the name really made my day :-)

[@MCsCreations]

And who doesn't love donuts? 😊

[@JjMn1000]

Hmmm

[@chriskaprys]

Donut try this at home.

[@blackred5155]

Asu

[@satviksharma1146]

I am going to love this series!!

[@greatscottlab]

Glad to hear that :-)

[@jfk4229]

I find it kinda odd that Altium Designer gets marketed to makers. Like 95% can't afford it anyway!

[@liquidsonly]

99%

[@luizdanielsantos]

99.9995%

[@daanb7894]

Right, even for work I design PCBs occasionally and I thought I'd try Altium instead of Fusion 360 but then I saw it was around 3500 per year and I was like nope. Now the Altium salesman won't leave me alone and keeps calling my work.

[@navidmafi]

wow i was waiting for another video from "found on the internet" series. Great video!

[@greatscottlab]

Glad you liked it! There will hopefully be more episodes.

[@ayman6516]

I'll hold your beer if you made more

[@fiordhraoi1]

I appreciate this, especially as a novice. It seems like the bane of all of my projects is trying to fit in Lipo charging/protection boards + a boost/buck converter, so I can understand the temptation to try to find an alternate approach. The fact that I am looking at making wearable things minimizes that temptation to move away from safety, though. :)

[@mr.meticulous1241]

Literally! I would love to portablize so many projects but I always get tripped over "simple" power circuitry like this, worrying about charging currents and battery heat, etc.

[@KamranKhan-co6ox]

Scott can you please make one such video for audio amplifier circuits found on the internet?

[@CircuitCreator]

Which kind of amplifier you are looking for

[@KamranKhan-co6ox]

@@CircuitCreator any audio amplifier bro...from a simple pre-amp to multi-stage and class A, AB, etc. There're tons of amp circuits you can find on the internet

[@blanana_m]

Everytime I circuits built without a board, it makes me nervous as hell one wire shorts and the whole thing just blows up

[@geovani60624]

nah, everything used to be like that in the old days

[@stevebabiak6997]

@@geovani60624 - and built like that in metal chassis. For those too young to understand, vacuum tube devices like TVs and radios were built like that in production a long time ago.

[@legominimovieproductions]

Built an 4x 18650 charger once without much knowledge, powered by the 5v rail of 350W atx psu😅 well the diode i had in the setup obviously was overloaded by the factor 4, then the diode cracked, the springs of the 18650 holders began glowing and it was a total desaster with 4 half charged 18650 cells😂

[@keithking1985]

@@legominimovieproductions ITS ALWAYS THAT ONE LITTLE THING YOU OVER LOOK THAT F's IT ON YA!

[@1Hippo]

Isn't that the fun of it?

[@Kyuunex]

Meanwhile ebay sellers: **wiring the USB plug directly to the battery**

[@adlerweb]

Ah - they have internal protection for a reason, right? And noone would ever remove it to save money, RIIIIGHT?

[@Kyuunex]

@@adlerweb at least some flashlights that charge via USB are like that. they also come with a cheap 18650 that probability has no protection.

[@adlerweb]

@@Kyuunex Well, an overcharged 18650 also produces light, so it's a win-win, right? :D

[@caffeinatedinsanity2324]

I never knew negligent batterycide was a legal thing. Turn rechargeable batteries into disposable ones :)

[@chrisellingson123]

I was going to say working with lithium is more nerve-racking compared to mains supply. 😂 These are missing an important feature; charge termination based on the cells specified termination current. If left in CV the cell will heat up, overcharge and swell/pop a CID.

[@sunilkulkarni4426]

WAITING FOR GREAT SCOTT TO UPLOAD AND HERE WE GO!!!!

[@greatscottlab]

Hope you like the video :-)

[@omaribrahim5008]

@@Rachitkivines it will be too slow

[@vladd9344]

@@greatscottlabI LIKE IT!

[@Katupiry]

With a single extra resistor on your Comparator charger setup, you can create hystheresis and end the oscillations. Usually CV charging stages inside dedicated IC's are implemented in a similar way inside the chip dye

[@SirDella]

I'm glad the lovely tp4056 module exists, I'm using one as I watch the video

[@prte100]

Im so happy about their existence, made in china, but works perfect and for less then 1$ from china, quiet enough and good for every battery project.

[@michellepowell1956]

"Hold my Beer while I ....." Love it!

[@princebanini]

It is always most important to understand how a circuit works before using it. That was cool

[@Boogie_the_cat]

I really appreciate this topic. The fire with lipo batteries is bad enough, but the huge amounts of toxic smoke they produce is another huge danger. I see a lot of youtubers treating lipo batteries very casually, using very dodgy practices and not taking the risk seriously. i have firsthand experience with a lipo battery fire. thank goodness, it occurred outside (due to the smoke) but wasn't near flammable vegetation.

[@iamdarkyoshi]

Isn't an "anti trickle charge" cutoff an important part of lithium charging? I thought that leaving them on a CV source for a while can cause issues, which is why the tp4056 shuts off once it decides the battery is charged

[@eDoc2020]

Yes, at least if you use a constant 4.2v. If you use a lower cutoff voltage it might be okay.

[@vitruzicka7542]

You should consider changing the name of the series to: Anyway, I went on the internet and I found this:

[@CircuitCreator]

🤯

[@fabianrudzewski9027]

Those lipo batteries should have a charge C rating printed somewhere. You get the max charge current by multiplying with the capacity.

[@DoctorX17]

Personally I just go for cheap little charging boards that use a LiPo charging IC, which usually you can just integrate into a design if you get to the PCB stage

[@Eagle-md6ku]

Please do more of this!!! Totally love these videos! You're sense of humor comes out and makes the video very fun to watch

[@PaintmanJohn]

Dead Bug style would be better than all those parts suspended in MID AIR. I like to build ONE OFF designs without a breadboard. Simply mount your biggest parts that will support others to a piece of perf board , or even a sheet of plastic. I have used Double Sided tape, hot melt glue, Super Glue, NYLON nut & bolt hardware, and even just solder to hold parts to a copper sheet. Also makes a great RF shield. Others have used a piece of wood or GLASS to support parts, as well as insulate them. Some groups even get together for "UGLY CIRCUIT" CONTESTS ! Any takers ?

[@inceptsquad9516]

This video type is an amazing idea hope to see more in the future

[@greatscottlab]

More to come hopefully

[@prisedeterre1356]

This series really makes my day ! What about some high voltage circuits you find on Google images next time ?

[@Kevin-xw1eo]

DYI or buy suggestion. Scoreboard for a ping pong table. Most that I've seen are either just flip boards or like $200+ units. I feel like 2 buttons, an LED display, an Arduino, and some holes drilled in a table could be had for less than $50 and an afternoon.

[@pavelperina7629]

I was thinking about something maybe even more crazy - capacitor that is charged by PWM (up to 10mA limited by resistor) from MCU and discharged via resistor and also connected to gate of mosfet. Then monitoring current and voltage on battery via ADC inputs and controlling and regulating PWM->Mosfet gate voltage accordingly.

[@antkoos]

I think there is a schematic with a lm317 where you don't need to use 2 IC's, just one could regulate the voltage and keep a constant current

[@smithperks3313]

Just addicted to Great Scott, I have missed your videos,thanks for this,,,Masterpiece

[@greatscottlab]

Enjoy!

[@Somgosomgo]

Glad to see you switched over to Altium. I use it at work. Can't see myself ever going back to OrCAD or anything else.

[@Geniusinventor]

Please do a video on found on Internet on sound amplifier circuits . I want to know how chip and good and a Internet amplifier can get

[@Bhavesh_g20]

Waited for you to upload a video I went out of my room and when I came back I saw my laptop giving me notification of your video Was very excited for video And the video completed its expectation correctly :)

[@greatscottlab]

Hope you enjoyed it!

[@sebastiannobody1142]

As you have a common model rc lipo you can charge them with one 1C (600 mAh). Better ones are also rated up to 4C. But this could reduce their life span.

[@TiagoDdA]

Scott, LiPO batteries, specialy Tattu bateries, can be charged with at least 1C, some of them can reach 2 or 3C

[@foogod4237]

I really expected this to be much worse... But still, proper circuits based around real battery charging ICs (like the TP4056) are so cheap and ubiquitous nowadays, I really don't understand why anybody would want to make their own anyway.. Why not spend that building time on making whatever your main actual project is?

[@rickpontificates3406]

“Where’s the KABOOM? There’s supposed to be a KABOOM!” -Marvin the Martian

[@ThriftyToolShed]

Awesome video. Thanks for sharing!

[@bekiryufka]

Hey Greatscott! Why don't you use your old constant current load for cc charging the battery. I think that your old circuit should work. 🤔🤔🤔

[@bekiryufka]

Good job btw.

[@Delwin_Cardozo_27]

It's better to buy a branded and high quality charger for such lipo batteries 🔋. Thanks 👍

[@greatscottlab]

Yes, true

[@pistonsjem]

USB Li ion battery charges are cheap as hell online, anyone who DIY's a charger is crazy!!!

[@Leroys_Stuff]

The sketchy circuits I found on the inter webs is the best.

[@Nitish_Biswas]

Can I charge 3 X 3.7v (series) battery pack with 12 volt supply?

[@greenvm]

No

[@theelectrifier4060]

@@greenvm but why ?

[@Nitish_Biswas]

@@theelectrifier4060 may be slow but 11.1 battery can be charged with 12 volt

[@greatscottlab]

Use a proper LiPo charger that monitors the voltage of each cell. There is a link in the video description.

[@Nitish_Biswas]

@@greatscottlab ok thank you GS

[@slappyrats]

Man your videos are so informational! Great content ❤️😁

[@akhurash]

Great video. With how cheap components are now a days (well I guess before COVID), it’s safer and easier to just go with a charger IC/module.

[@navidmafi]

wait how tf this comment is from a week ago. i guess the video was private

[@zzlg]

@@navidmafi he's a patreon member

[@ott0dott0]

Hey GreattScott! I was wondering if you can review some Google circuits about temperature regulation for a soldering iron. Thanks, love u !

[@iuryave]

"Hold my beer " says the german. Stereotype alert! hahahaha

[@SinanAkkoyun]

I so much hoped he would do the good lipo charger and explain it

[@nixxonnor]

Nice video that adds to people's understanding of how stuff works :D

[@dfgaJK]

Please end these videos with a working diy example to whatever level of complexity is required to achieve the optimal charging result. Ie make an example with a dedicated charger IC.

[@avejst]

great project 👍😀 thanks for sharing your experience with all of us 👍😀

[@adityaagarwal6719]

Please do one episode on Tesla coil

[@safetysecond55]

Next video on a power supply Please a lab power supply

[@greatscottlab]

Already did a lab bench power supply video. Or you means with testing circuits from the internet?

[@sheogorathboon8256]

One thing I noticed with most of these circuits on google or bought on ebay, none feature redundancy i.e a fuse or voltage supervisor. if the circuit fails it has to fail safely.

[@user-mp3eq6ir5b]

I have recently started studying Power Electronics by downloading tutorials by Great Scott, Kryalin3D, AfroTechMods & a few others. I just picked up a tiny Oscilloscope & an older Power Supply to help me understand & test my projects. I almost started in 8th grade buy the teacher retired the summer before. I dream of turning an older Tesla into a Giant Power Bank!

[@greatscottlab]

Very cool!

[@oakkar7]

Simple and clear as usual. Can you kindly recomnend or test any simple lipo low voltage cut off circuit with only discrete components? Most cheapo lipo charger and bms module seem didn't support low voltage protection.

[@rp1570]

Love u videos of 'circuits I found on the internet '

[@greatscottlab]

Brilliant :-)

[@neutronenstern.]

3:52 but then it never will be full. To get it full you will have to go over 4,2V due to the resistance of the wire and inner resistance of the battery. So load it with more than 4,2 V for a short anount of time, then stop loading while mesuring the voltage and so on.

[@GODAXEN]

I made one using the L200C instead of the LM317, is a 5 pin TO220 voltage&current regulator lamentably if I'm not wrong nowdays is considered obsolete and possibly also out of production.

[@rpavlik1]

Well, at least these are all better than a cheap power bank I once got, which just stuck a diode between USB and the battery... Yes, it all got very hot very fast

[@felixbrandau4751]

I learned so much thank you And I love the beautiful diagrams!

[@loukashareangas4420]

The first circuit has a 1.2 ohm resistor because it assumes that a fully discharged li-ion or li-po battery should be at no less than 3V, so you then have a 1.2V voltage drop on the resistor, thus 1A. The 1.8 ohm for 1.5 A doesn't make any sense though. It's obviously a typo, as with 0.8 ohms, ohm's law is in agreement.

[@greatscottlab]

Yep, I think so as well.

[@jj74qformerlyjailbreak3]

Great Scott Love your work. Glad to see a new vid.

[@greatscottlab]

Thanks 👍

[@Tsnafu]

There's nothing safe about those bare battery leads (and both cut to the same length as well) - solder a JST or an XT30 plug onto them or at least screw them onto a terminal block.

[@bundokz1997]

I can use this to charge my 18650 cells laying around here. Nice video as always

[@alla_alsayegh]

great as always

[@greatscottlab]

Thank you! Cheers!

[@emiliorivas9819]

Is there a specific reason why in this video and in the diy charger you didn’t include a balancer?

[@madtoffelpremium8324]

Would have been interesting to also do an efficiency calculation.

[@blackred5155]

Tebak, saya dari mana?

[@pcbdesign819]

It's great video, i really like the way you do it.

[@RichardSmithers]

I am surprised they were mostly safe and mostly worked. I expected some horribly dangerous circuits hooked up to mains voltage.

[@TomUSAF_VET]

I have a question I would like answered please. I have 2 Bluetooth speakers that have around 10 hours of play time each, but I work 12 hour shifts. At one point the charge port broke off, so I opened it up to add a more robust charge port. There are two 18650 LiPO batteries inside and lots of spare room. Is it possible for me to solder in one more 18650 LiPo battery to this pair so I can get more play time? Thank you for your awesome channel! I am learning so much.

[@thekaiser4333]

Testing questionable Schematics found on the internet! That's a great idea!

[@kimchristensen2175]

Considering that those premade LiPo charging boards are so cheap, will properly terminate charging, will safely recover an over discharged battery, and optionally also have over discharge protection (None of those circuits shown do those 3 things), people really shouldn't be building these less than ideal circuits. It wouldn't surprise me if the cost of x2 LM317s and support parts cost more at some venders than those premade ones.

[@clems6989]

Waiting on next video in this series..... BTW, I think this is a great !

[@michalkana9764]

Great Scott, please can you make another 3D printer reviev for Ender 3?

[@greatscottlab]

Not interested at the moment. Sorry.

[@michalkana9764]

@GreatScott! That's ok, i was just asking. Still awesome video. Keep this series. It's intresting theme.

[@niar491]

This series is great :)

[@fajakbar1851]

Nice! I really love this, maybe you can test circuit like overcharge and overdischarge. Overall, good job!

[@Nicolas-bo3we]

A small remark: you should draw the arrows for the voltage the other way around!

[@omsingharjit]

11:35 it's Not safe ....! Why ... Because what will happen if Controlling 317 ic get damage because of heat . it will act as Conducting wire , so it will let current pass through its input source to the connected battery and then Electro Boom .

[@TheMechanicGamerVids]

I really like this series 👍 good work

[@greatscottlab]

Glad to hear it!

[@fixnreview]

Watching from Ormoc City Philippines

[@kakugeiikkikomori-iko7775]

Maybe you can try seeing if it is DIY or BUY for a 20MHz bandwidth low voltage(

[@melplishka5978]

Funny thing I used a 12v battery charger one and needed to modify a bit for added safety lol but wasn’t too bad , even efficiency was pretty good lol

[@arunshettar2842]

So far you made a temperature measurement video (part 1) where is part 2 please upload I am curious

[@greatscottlab]

There will be no part 2. Sorry.

[@arunshettar2842]

@@greatscottlab it's ok

[@The_Weeezard]

Remembah: kaykillating the suhkit current is mandatory!

[@electronic7979]

Helpful video. İ like it

[@melplishka5978]

Good one Scott ty

[@wizrom3046]

You can buy a 3pin fixed voltage linear regulator in 4.2v. 🙂 And with a current limit resistor you have a 2 component safe solution. Also, if the input voltage is known (like a fixed 6v supply) you can put the current limit resistor BEFORE the 3pin regulator, giving a very good fixed current limiting until it goes onto V regulation...

[@alexstone691]

That is a great idea

[@deepakjoshi6242]

**Saving my spot to comment after watching, xD !!

[@greatscottlab]

Hope you enjoy it :-)

[@izerpizer]

In regards to your sponsorship at the beginning for anyone looking to get some good PCB designing software: I would instead highly recommend KiCAD. It’s just as good if not better than altium and is free and open source.

[@ppsps5728]

Even though I do more software that electronics , feed by electronics loving brain mainly through KZbin channels like yours.. Keep up your great work and nice explainations.. A small request from my end .. SW radio and Plasma ball .. Please add to your list ..

[@jdpantoja442]

Very inspirational video, thanks Scotty!

[@greatscottlab]

Glad you enjoyed it!

[@JawadAhmadsahibzada]

Great 👍🏼 Scott !!!

[@greatscottlab]

Thanks 👍

[@RoyalTech_2024]

Hi Great Scott, any scope for a MIDI synthesizer project?

[@msmith2961]

"Hold my beer" 😁

[@TheBackyardChemist]

surprising lack of fire hazard

[@secretwebsite]

Do more lipo battery videos! I want to know more about using them safely.

[@greatscottlab]

I did a few videos already about them. Feel free to watch them.

[@secretwebsite]

@@greatscottlab Try making a Lipo battery charger with a buck converter instead to increase efficiency.

[@sixtus1862]

@@secretwebsite Just get a switching li ion charger / ic

[@keithking1985]

waaheeyy. the two LM317 circuit would have been the way i would have solved it.. its great when you see that your actually learning this stuff. : ) PLEASE DO MORE VIDEOS LIKE THIS ON CIRCUITS YOU FIND ONLINE.. p.s. anyone who wants to know which to put 1st when making a CC/CV circuit with 2 LM317's you always put the CC one 1st & not the other way around..... CLASS BLOODY VIDEO BUDDY.. 10 THUMBS UP. ; )

[@m.s.m8918]

Love this series!

[@greatscottlab]

Brilliant :-)

[@pesho9971]

I've always wondered why put the CC lm317 before the CV one.Wouldn't it make more sense to go CV first then CC since when the current start to drop the CC lm317 wont have to do any regulation?

[@thepurpleone7153]

NOOOO, NOT YOU, NOT NOW NOT LIKE THAT, NOT ALTIUM

[@KC-yk5xe]

I charge my drone lipo at 2c with temp probe going to the charger, and i usually do 1c on lipo and .5c on liion (when doing it safely?) Btw great vid as always