DIY How To Make a Powerful 12V 18200mAh 420A li-ion Battery Pack 

hello guys. This battery i make 3 years ago and it's still working, for charching i use SKYRC iMAX B6AC V2 charger and i don't need any BMS for this. For battery security I'm not afraid, becouse the board where i use this battery already has security board. If you don't have experiance working with li-ion battery please don't repeat this at home. Thanks

Thank you very much for your time and information, I tried the capacitor that came with the package 35v 1000uf and its seems to work great, it seems to work very good with the car battery that I got CC 550 Amps I have no complaints at all, big thumbs up.

Loved the way you made it; so organised and neat. Congrats 👏 I’m also interested in those homemade spot welders. Do you consider doing a video on it? It would be great 👍🏼

This came up on my home screen and I thought why not, it cool and leaves you with a strange (purely because I did nothing but watch) completely satisfied feeling 😁

Sounds INCREDIBLY DANGEROUS… I’M IN! 🤪

I would love to see a 280 amp load test. You are high if you think you are going to flow over 100 amps through Nickle stripping that size for more than 30 seconds.

Also, make sure your connections are pure nickel, not nickel/steel as the steel used may corrode over time as 18650 battery does gas out when charging.

Finally a video where they actually know how to solder! Looks great! I neeeeeed a spot welder!

4 series connections at 0.2mm nickel will safely get you 6.4A x 4 = 25.6A continuous, not 280A. Look up the Ampacity chart for nickel.

Tre celle Liion in serie possono essere caricate al massimo a 12,6V mentre gli alternatori delle motociclette raggiungono i 14V, quindi nonostante il BMS le celle si danneggeranno... Occorrono 4 LiFePO4 in serie per poter sostituire una batteria al piombo da 12V nominali, infatti queste saranno cariche a 14,6V e scariche a 10V esattamente come un batteria al piombo da 12V! Io uso le A123System e vanno benissimo, oltretutto ogni singola cell 26650 può erogare 120A di corrente istantanea, altra roba!!! ;-)

Отличная работа, а главное аккуратно.

ALL wires must have mechanical connection together before soldering and heat shrink tubing. Twist bare wires together first, then solder. This helps you not to have cold solder joints and have a possible short or open circuit. Use a buck/boost converter for different voltages. It can be affixed to case externally or internally if you have the room. No special tape or paper insulation needed - use cardboard/pasteboard and hot glue to isolate and hold down battery. Leave top glued at spots with hot glue so you can open battery box to make changes if needed.

Excellent job great vid thank you👍

You are good at making some DIYs dude

Nice Time Lapse!

If you draw 280 amps, or 40 amps per cell, or even 420 amps at most or 60 amps per cell, I hope you run really fast

Looks great, but be aware of that series connection you made using just nickel strip. It will not support the full current of the battery, or anywhere near it.

From the looks of it you are using Sony/Murata VTC5 cells, they have a capacity of 2600mah and a max continuous discharge rate of 20A so really the max current you can continuously draw is about 140A, that is still a lot but nowhere near the 420A. If your cells really could do 420A together then your capacity wouldn’t be 18,200mah, it would be lower. Other than that, great video!

This battery would work to power that mini spot welder right? Anything 12 volts around 400 amps is what's recommended. I got a car battery to build it with, but I want to build something smaller to power it.

I think you should also choose 18650 batteries on the basis of their similar internal resistances as well (besides rated & measured capacities). As some batteries might be failing by having high internal resistance. 🤔😕

Rc battery spot welder good invention. Thumb up.

how is the spot welder holding? is it worth buying?

that video was so smart thats the first one that made not using a bms 4 me so easy to understand from now on i wont be using a bms thanks for that very intuative video

This video shows me that buying a bettery is better than creating one 😂

Can you please make a video on The spot welder that you used in this video 😄

I am thinking that even after I got good at making those (and it was my speciality,I was an auto mechanic) I am certain 3 hrs. I may be surprised at perhaps a bit more time. There is a popular battery powered solid state guitar amp (excellent preamp/amp design) that runs around off of a 20ah 12V lead acid battery. There is interest in a lithium/ion upgrade. I could assemble the battery packs at perhaps net 15.00 per hour? Replacement lead acid is only 20.00 off Amazon and it being solid state the amp runs a long time off of the 20ah batt.

Why did I just watch this whole video? 😂 Nice music!

That lipo is rated for 5000mah or 5amps x60C = 300Amps which gets closer to 420A as you stated but there is no way those 18650 will put out 280A especially over those .2 mm nickel strips. Those might do 20A on a good day in short bursts with out melting them but you only have 4 linking the strings together. That's a max of 80A. Which is still impressive for a small battery pack and it is a nice build. However those 40A 18650 are also way over rated at 40A. Do an actual load test on one of those and see...

Those are rebranded Sony VCT5A that have a 25A continuous discharge rate. There is no way that battery will put out 280A continuous and 420A pulse. Four 0.2mm nickel strips between series connection are not going to handle those amps. I will estimate under 100A. Plus the batteries will not be able to put out that many amps.

Cool stuff I have a bunch of 18650 Layin around from when I used to Vape. I wonder if I could take all the married pairs I have an make some little power banks for led lights on my mountain model for RC crawling. I wish their was a voice over for the important bits as one wrong move/connection can be really bad. If you’d ever make another battery pack video it be great too see how to make a smaller battery that could be used to hook up lights on a model. I used a standard 3 wire RC servo for led lighting around the model is what’s in my head but no idea how to power it. I’m thinking as in RC lighting usually is a 7.2 V Li-Ion battery id like to use 2 18650’s in series for a pack that could be hooked up too 2 sets of LED’s for each battery pack as I get confused when soldering lots of wires together for one power source. Thanks if my rambling made sense I really appreciate the help Cheers 🍻

Hi , which battery pack you used for that spot welding?? What is current output for that battery pack used with spot welding Machine

I liked it very much. Your level of work and instruments- nowhere less than japanese and western guys.

if all the 21 cells are connected in parallel even then it can give a continuous current of 2×21 = 42 Ampere ( MAXIMUM ) not 420 Ampere & even then the voltage will be 3.7 V nominal ( between 3.0 & 4.2 V )

Super creativ! Nice video! 🎵🎶 Thanks share! 👍🛠Like🔋👍

Looking at the headline 420 amps - that's 60a per cell ! Even 280a (40a per cell) are some kind of expensive 18650 cells.

Why dont you make a video about your spot welders how to use and which is good for which type of battery??? And so on.....

Чётко, аккуратно, мощно молодец

👌 it looks so easy with you! 🤷‍♂️ I need a 3s5p battery with at least 18ah. Can you give me a brown one please? 😂

Браво!)

小朋友…记得保重身体咯~ 恭喜你发大财…！

Ye Spot welder ka video banao i need this

Where do I set this thing you’re using to spot weld this with that’s awesome I need one

Can you link that flat cable resin solder and gun in here. Im also looking for an 4x18650 surge protector board to link them. I'm trying to make a good Bluetooth speaker battery for my good Bluetooth speaker

I urge you to change the title and description of this video because even if the cells can handle 40A continuous and 60A pulse (which I doubt because for 18650's that is extremely high!) then your nickel strips would literally melt way before those current numbers are even reached. What you are claiming is dangerous and viewers without much knowledge will hook this pack up to their car, thinking that it would work. The pack will definitely fail and a fully charged li-ion pack that fails is extremely dangerous!

The outgoing terminals are rated only 20-40A

Could the the soldering joint support such high current ,for example engine startup current?

Why are there 2 different sport welders ? Is there any reason not to use the first one also at the end ?

Без каких-либо защит. Для себя устройство полезное, для массового использования, небезопасно)

Bro where did u get that spot welder, did you made it or is it available online??

Hola muy bueno el video, tengo un proyecto de fabricar una batería como esta. Como te han funcionado las celdas, dicen originales funcionan bien o son falsas y de menos mA. Saludos

Increase the longevity by putting a little cooling fan on that somewhere.. The batteries in the middle must get incredibly hot..

Where can i find the manual for this spot welder?

I think you should balance the voltage before combining them in paralel.just for extra safety and extend battery life

I noticed in your description there was no link to the bms for this project

Halo Teman Salam Kenal , saya lihat video Anda sangat suka sekali , anda memang orang yang kreatif membuat accu sendiri , terimakasih ilmunya saya akan mencoba nya

Congratulations on your videos, I would like to know if in the realization of the spot welder, instead of the LiPo, it is possible to use a power supply.

Clean work. I love it..

Your spot weld is great. Where did you buy and how much?

Well shown building process! Three remarks: First. The cells seem to have quite different voltages. For safety normally you would first (dis)charge all cells to storage voltage (3.6-3.8 volt). Second: I like the casing. Would it not be easier to turn the upper part (cap) 180 degrees and use a longervthick red and black power cable towards the outer connectors? Now you have to fold two stiff thick wires to close the cap. Third: You glue the cap of the casing to the lower part. To open it you will probably have to destroy the casing. Why not use a good piece of self adhesive tape? Greetings Gerard

Отличное видео лайк 👍👍👍

Nice job! What is the cleaning flux in the syringe you are using?

How are you tack soldering those batteries together? Nickel strips ?

What is this spot welding machine used ? Please let me know

High quality job....keep doing and showing US.

Thank u for showing this, but I would like to ask you if we want to make a 6v 3A 3W

Do you have to have a special charger for this or will my charger for my 9 ah SLA battery work for this?

Fuldstændigt suverent❤️❤️❤️❤️🏁🇩🇰 prof

чТО за сварка? Есть схема.

THIS IS A DANGEROUS TUTORIAL.

not bad assembly, at least only one fuse had to be installed

Love from Assam 💕💖

Ooo great idea👍

if i connect this battery it works connected to a solar panel with 30A controller?

안녕하세요 좋은 정보 감사드립니다 잘보고 갑니다

only thing I would change is the power cable, too thin for high load ... sure it depends about what you connect it to...but still...too thin for my businesz

That's not 12v, it's 11.1v . 12v is from 10v to 14.4v due to use cases. This stops charging at 12.6v, so a real 12v pack is actually a 16.8v fully charged.

what do you use to charge them?

A onde vc conseguiu esse equipamentos?

This had to have cost at least $100, probably more like $150.

Это без БМС ? Зарядное устройство само является БМС ?

Hi I'm in need of a 12v 18ah lithium like this, do you sell these completed?

Thanks for sharing. Everyone need to bare in mind that you can't use this battery in UPS without modification UPS itself.

Nice job

that was relaxing to watch

Nice..balance port. so you charging with lipo blance charging mode.. same, i never use BMS. Last 2 and half year for mini my power station. Keep it up.

Hi, Interesting and cheap spot welding solution you made yourself there. I liked that the solution was clean, however as an instructional video (which it looked like you were making). Then it would make sense for newbies to have an idea of what you are doing. Not adding a BMS isnt exactly a good practice. Even during discharging you can encounter that some cells might go below the recommended voltage and although that might not be a short term problem it will most definitely be a long term problem. As for the overchange protection you had a balance charging from your RC hobby charger. But it is also importent to note that it was in balance mode and not standard charging mode. Having similar age cells will making the balancing easier on the BMS so you might get away without using a BMS if you set a cutoff in min and max voltage before you can hit the marks. Anyhow I would like to emphasize that the whole package looks clean and is one of the better videos on YT with diy packs. You also clearly have an idea what you are doing during soldering. What i dont like is the Current 280A , Pulse current 420A part where im guessing you are referring to the lipo pack ? Its misleading. For all the people wondering howmuch current you can pull through it then the recommended discharge rate per cell is capacity * 0,5 up to 0,8 so for a 2000mah cell you are talking 1000-1600mah per cell * amount in parallel . Your busbar in this case nickel strip will also play a factor in this. Keep up the good job.

I will try to make it

20 банок по 200 рублей за штуку это сколько денех? А если брать хорошие аккумуляторы? оно того стОит?

You need a spot welder to make a spot welder ,How classic 🤣🤣🤣

Hi, which AWG do you use for spot welding and which one is on the accumulator (MOSEWORTH)?

mate can you help me .. i got an e-scooter with 15.300mah (15,3Ah) battery.. that would be about 6 x 18650 or ? i want to build an extended battery for more range :)

Test the battery before you glue it!!!

Perfect !

I have and intest in making a battery for a 12v lift. It currently has 2 12v 12amp hour batteries and one that is 12v 7 amp hours It have a 100amp bracker on it. I am looking to make a longer lasting version for this

How much did you spent??

12.6 volt when fully charged.

Please share battery charger and drivers details,, Great effort Thanks .😊👍

Hay lắm Bro!

Where are the BMS? Or you need’t it? Do you take care of the battery safety? It will be very dangerous!

I wish I could do this but my wallet says no...