Your SMD soldering skill has become so much better than your previous one. Appropriate amount of flux was given. Louis Rossmann would be proud of you.

Just FYI, your videos got me through a seriously bad time in my life and I am thankful for you. This hobby saved me and God provided!

Thank you for taking a look at my BMS design. I have a new version 4 that I am currently working on which removes the higher current drain on the cells to less than 1mA, the software is also more flexible.

Really pleased you got use out of my fork of the code and found the extra features of use. Thanks for featuring my channel and great video.

Duuude lets see this BMS in action! Make a charger for lithium ion batteries next! That'd be so dope

When Scott does something he does so that it just looks perfect and nice.

I have been using the diy bms project for a year now. The work Colin H has done is great. Tied right in to my grafana setup.

I like the way you present everything clearly.. Even a simple formula for all to understand.

Perfect episode, I was trying to build my own BMS for quite some time, but everytime i failed. Thanks for the power od your chanel now I'm able to build one on my own :)

Its funny i was searching for these videos for the fist time about 12hours ago. and here you go making one basically as perfect a timing as you could.

Loved the extra balls of solder (04:04) on the commercial unit straight from the store! So much for build quality control...

I am a biologist, but your videos have taught me so much about circuit design. Thank You!

Well that was unexpected! Great video as always. Thanks for featuring my channel.

Scott, you are the best I ever seen about electronic modifies. I want to be great at understanding electronic devices like you.

For smaller projects I still like using a TP4056 wired parallel on each cell or cells of the series pack so for a 2P 4S I have one TP4056 on each 2P = .500mAh each cell x4 Chips using 4 separate phone chargers for isolation and you can use the single cell protection strips for unprotected cells so they shut down before under voltage. Cheap and works.

Commercial BMS : I'm simple and available. DIY BMS. : it's complicated

Fantastic incredible job I love these diy or buy videos🙃

I am hoping to see something eventually come out that is nearly as comprehensive as a Batrium system but more adoptable for smaller projects. One specific need though is for higher current output through any of these BMS solutions at the small side. With the attractive nature of building high capacity portable battery packs, the ability to push a lot of amps is a must have if you also plan to feed the power into an inverter, especially if it is only a 12v inverter. I am starting my first project and have some of the 4s 40 amp BMSs on the way and a dedicated charger like what they sell on Vruzend. Should be sufficient for what I am up to but I am watching and looking at things a lot. Still not seeing that magic solution yet...

You are so clear in your explanation! Perfect! So DIY for powerwall, and commercial for small packs...

Best BMS explaination on youtube yet ..... Thanks scott

Thanks to greatscott,Im now great at soldering!!

I think it would be really great if you could order for example ten times the components you need for a project of yours and put them up for sale in kits consisting of everything you need except tools. Great job on all your hard work. I'm definitely enjoying the results.

Been so curious about BMS's lately. Thanks for a great vid

Wow! I've just discovered your channel: I wish I'd found it before. Excellent in-depth stuff, well filmed and explained. Thanks.

Interesting....🤔 Thank you for the information and keep it up!!!

When making power bank from parallel batteries I would use Schottky diodes between the common junction and the battery positive to prevent weak battery from pulling down the strong one and thus exhausting / draining the overall power. This also provides protection against defective batteries. I would also use protection circuit (simple one) to prevent over charge and/or protection against accidental short.

Great Scott is becoming... "Greater and Greater" Scott. Awesome videos

That ad spot in the middle was probably the smoothest segue to one I've ever seen! :P

Great Scott! this fellow is left handed.. I always knew he was brilliant!

will you make some projects on audio electronics and please make a video on how to make a NPN common emitter power amplifier.

Wow! Very creative indeed dude. Your video tutorial (electronics) is the best i watched so far. Every information of the components, schematics, mathematics, technics are all there making it a stop learning experience. Some words i might miss due to accent but its not a problem. You are imperfectly perfect. Thanks and stay creative.😀

I have been experimenting with these type 18650 packs for about a year now. I have built dozens. I use a fused nickel strip on most of mine now, all of them that have more than a few cells in parallel. I accidentally did short one while assembling it and all of the nickel fusable links glowed and melted, it was scary, but spectacular to watch, but it worked and potentially prevented a bigger problem. I just tested the cells and put new fused nickel strip on the top and it was good to go. I wish I had had a camera running. My point is that they are, in my opinion a worthwhile safety feature and insurance policy. For batteries in buildings, I have been building metal boxes for the batteries in case of fire. I do not have such charging and power draw as most of mine are working for small solar power collection and lighting backup. For me, heating of the batteries and thus needing to cool have not been issues. Every once in a while, if I have my thermal camera with me, I will look at them and see if any of them are heating, as they fail they get warmer when heating or cooling. I made some of my first packs from very old salvaged cells as those cells were very cheap to practice many of those cells were on deaths door, so I got to see failure modes. It is a pain in the neck to dissassemble a pack for a failing cell, so I try not to use cells that are too close to failure. I have taken to adding load disconnects and do not charge mine above 4 volts as I am dissatisfied with the BMS performance of the Ebanium and Amazonian varieties I have tried. I would like programmable LVD and HVD, but it seems that unless you build your own they are made out of unobtainium.

Sponsored by the pink markers ! :p Awsome video, like always

You should do video about reflow ovens! You do so much surface mount soldering, it might be worth doing a DIY or Buy. Nice video by the way.

Thanks! All the things I've forgotten since basic electronics class.

When I see Great Scott, I already know the video will be great .. as Scott.

Maybe compare DIY high capacity powerbank with commercial product ? Cause I want to build one in future. Also try to salvage lithium cells from old notebook battery

Great vid. Scott!!!-This is a passive balance/power bleeder-How about active balancing so not to waste power?

I needed this, and here you are. May you live long.

You're videos are best of the best and provides much more knowledge. After watching one or two video I have just become your greatest fan. Keep it up always. ❣️

Thank you dear Awsome!

I just got my DIYBMS pcbs yesterday! Still waiting on some components from china, but I will be making a 12s version to balance chevy volt modules.

Always Love your handwriting skills and of course your knowledge base

This is the best series from great scott

currently working on my own arduino based system. Don't have a main control board yet, but I have working cell modules, and they only draw 0.11 uA when idle and 2-7 mA when transmitting.

Great video! What is the maximum amount of cells you can use in series with this system?

Oh this was great. When you mentioned 1A of power, that rang with me and my project.

spot on with DIY BMS being for powerwalls and such. It seems to have better front end functionality than most of the cheap to midrange BMS units, which are mostly focused on providing BMS functions more than front end features, so you can end up blind on how your batteries are actually doing with most purchased BMS units - which isn't ideal for something that you want to closely and carefully monitor. Meanwhile anything that's portable, you may not care as much about what individual cells are doing, and just need a relatively simple (in terms of features) BMS to keep the cells relatively healthy, and shut down the current flow in the event of something dangerous happening (which you can later check into on a bench). Good stuff, very interesting.

I always BUY mine. I aint got the... Stark: what? Time? Me: The patience.

Don't you just hate when you accidentally build a lipo battery pack🤣👌

Thanks for the video. I am planning on building my own 18650 battery pack and I have a lot of questions about the BMS part of the build. I was thinking about a DIY BMS, but thanks to this video, I know that is not an option.

Congratulations for 1 million subscribers 🍻

Hey you should do a diy or buy wireless Qi charger

Well i think this is a good alternative for some projects but this doesn't provide balance discharging....It can only be used for balance charging .. Can you please also guide for balance discharging from the same bms..

Exactly what i was waiting for ... thank you 👌

Wow. My brain just exploded. Nice job, man!

It’s better to buy only, because cost will be less 👍🏼

18 $ shipping, nice)

AWESOME PRESENTATION! thank you for sharing your expertise!

You are always Great MR.Scott......

Well, you did not test nor compare the "cheapo" BMS as a comparison. which is what feels missing to me...

long story short: unless you have a microscope for smd sodlering and chirurgical precision, go for plug&play commercial BMS :D

Hi, thanks for your great Videos! I like them and learned a lot from them. But I would like to comment on two things ins this videos. 1. Your SMD soldering is good but I would recommend you to get some very fine tipped tweezer. When you soldered those bigger packages onto the smaller footprints you need to grab them tight and guided the into the solder. That way you can get a better solder joint and be faster. It looked kind of funny when you tried to poke the in the right direction. 2. Bootloader: A bootloader doesn't program fuses only. (That part I also don't know) But he programs a certain firmware in a special sector of the µC which tells him how to act on certain signals on his pins and where he needs to put this data. Keep up the great work and your great videos! (BTW: I love your handwriting and your drawing skills!)

1 amp balancing it huge.. I'll have to have a look into that project.. be great for balancing large ebike packs

Shame you haven't actualny explain HOW do design a BMS

Love me some lithium ion battery panks

The one video I've been waiting for.

I believe the DIY is the best option especially if you are hoping to making a product for future use. Once you fully understand the commercial vs the DIY, you will be able to fully appreciate a potentially better design for future use. Thank you, for your excellent presentation. By the way, Series is not the same as Serious (ha!). Thank you again

Awesome video 👍👍 To make BMS can we use TP4056 charging modules for each cell and then solder them on one PCB followed by connecting input wires? *Will it work fine?* If yes, this will be the cheapest and easiest way to do that..... Plz reply??????

8:46 "as well as the female headers" - solders male headers :D

Love the aggressive highlighting!!! 😁

I learn so much from watching your channel, thank-you!

Aren't there simpler DIY BMS's available? No need for all those fancy-pancy super features for a simple home made battery bank.

Watching this video after got burned by a lipo battery pack.. 😂

I think you're the man, that's what I think! What's your college or university background? And most of all I think you should shoot a video telling people why you chose it and why you love (and understand) it so much! Congratulations!

Thanks for this informative, useful video which also fills a large gap as there are limited knowledge available about this topic!

next up: "DIY or Buy: BMX"

Hmm I just made a lithium ion battery _and_ I have no idea how I did this 😂 guess I'll watch the other video.

Much respect, thanks again man for educating us!

Great video man! Thank u for uploading it

This is a mismatch, its like a go pro vs dslr both useful cameras with different application, what could have been the comparison should be that BUY vs DIY (of the same build of the buy).

Can you please say in a future vid: 2 cells in a series relationship, you could say, are married. Plzzzzzz

Nice review, thanks for sharing :-) about you solding SMD, then try to put the solder on the end of the IC/R/C, and then touch both (solder and solderpad) in a inward direction. 1 place the solder at the end of the IC pin. 2. touch the solderpad and then the solder in one motion, and lift in this manner, you dont get too much solder on the pins of the IC Thanks for sharing :-)

Great !!! Your vidéo is slow enough and seem to go through all the steps... it is si empowering that i feel I can use it to do a wall battery or a tesla car with it. Especialy i like the brightness of your video. I’m Marsu from French West Indies. Thank you for your video.

I haven't watched the video yet but YESSSSS this video came just in the right time!!

As always, another awesome video.

You just taught me bMS design! Awesome! 👍🏻

I like the way you hold the pen. :)

Great video sir. Your videos are always helpful to me as i am a beginner in electronics

who watches these videos just to watch the perfect penmanship?

Great Work as usaual Great Scott 💥

Hi Scott, great video! thank you so much

From research to practical applications is a long way. Technology is like that ! It is not easy

Muhteşem bir çalışma olmuş hocam. Batarya yönetim sistemleri önemli bir konu. Yazılım ile de çok verimli batarya yönetim sistemleri yapabiliyor ki en büyük örnek Tesla bataryaları.

Great experiment. I have also been looking at BMS units lately and many advertise "over discharge" protection but you did not seem to cover this. Do you know if that feature in the commercial units actually works?

Great video! It would be fun to combine this with your solar battery charger project!

awesome video! I'm researching batteries so I can rebuild some old Ni-cad power tool batteries. These BMS sound like the obvious solution. Seems some people opt for Li-Po battery packs or not using any protection and relying on voltage meters and custom charging solutions. This should allow accurate charging and protection to keep the voltage from getting too low in use. Thanks!

Great video man as always.

thank you, this will help me a lot! great video. a aktive bms with dc dc converter balancing would be thankfully seen....sorry for my poor english!

"Draws quite a bit more current". Of course! What were you expecting? Wi-Fi isn't exactly low power. And that's an extra in comparison to the commercial BMS, which can be removed to make them comparable, and save 3 €. In fact, you could also try NRF24s or other low-power solutions, combined with an ESP gateway, in order to make it better.