How to Build a 3s 18650 Lithium Battery Pack w/ BMS Tesla Power Wall fixed music

This video is a REPEAT of an earlier version of the same video without the loud music when I'm talking. It's about how to Build an 12.6v 18650 lithium Battery pack for an electric bike or solar generator or a small Tesla Power Wall. In this video I will be using authentic Samsung 25r 18650 lithium batteries. I am building a 3s 8p 20ah 12.6v battery pack.
To visit our website click below:
www.westhattechguy.com
/ westhattechguy
Battery charger: solargeni.com/12.6v-3s-5a-lit...
If you would like to view / purchase these and other batteries we have available click below:
www.solargeni.com/
If you want to build your own generator, and need supplies you can check out our Amazon store by clicking below:
solargeni.com
BMS 25a in this video: amzn.to/2KMcKHK
This video shot and edited by Derek Smith
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Music
Hitting the Streets - JR Tundra
Half Pipe - Huma Huma
Free Dog - Silent Partner

[@sreekumarUSA]

That was a clean job. I learned to attach the BMS with separate Ni strip. I usually lengthen the Ladder towards the BMS. Thanks. A job well done.

[@WesThatTechGuy]

Thanks so much Sree Kumar!

[@mmtruckingllc657]

Probably the most simple to understand pack I've seen!

[@ARepublicIfYouCanKeepIt]

That's because it's missing a few components. Should be 4S, and include balancing (via an upgraded BMS), as well as charging, at a minimum.

[@WesThatTechGuy]

John It's not missing anything? It's a BALANCE BMS and 3s? Why should it be 3s? You can make a pack in any series one desires. Charging is as simple as connecting one to the Red + wire and the Black - wire

[@Gulshankumar-ni8xb]

What is AH of this battery and max amp please tell

[@Mazel_Tov_888]

Straight to the point in and out just like it should be.

[@WesThatTechGuy]

thanks

[@lougaru2445]

That was presented easier than any other video I've seen. The only thing I was confused about is how exactly to attach the BMS to the battery

[@rasheed-ameen]

Thank you. Can you explain the charging and what is the optimal charger?

[@josephbohley6506]

Keep up the good work and your are a very patience person to help out everyone in the comment section. Maybe a lithium book on how to build batteries would greatly help other people understand lithium batteries a little better. Best purchase it made since trying to understand and learn about dc voltage amperage and capacity. Plus i don't like to read but have a great understanding of ac voltage from doing hvac work for 15 years now. Keep up the good work you are a great teacher

[@TheTwistedStone]

Would I be able to link several parallel packs and add more in future to my solar setup ?

[@itsallaboutlifeeasy6206]

very nice video clearly i understand, but which charger i have to use 12vt 3amp is that enough

[@RA-qt5ky]

Hi, I built a 3s7p, 40a bms looks similar your bms, everything works except when I charge the pack, the charger seems always charge at constant voltage mode and the current is low, fraction of what I set it to charge at. Any ideas?

[@andrewwyatt2542]

Good job mate will have a go at making one of them. What do you use for a charge source cheers

[@pianobar7801]

very helpful, thanks for posting.

[@fatsalda]

Good morning . What is the capacity ( Mah) of the batteries they put in and how do you calculate the final Ah?

[@saleemkader2126]

Thank you very good video step by step . Please can you make a video how to solar charge.

[@HungNguyen-li3fq]

Might be a dumb question but how do you charge this? What charger do i need to buy

[@juanvazquez954]

I’m doing a 3s2p 12.6v battery pack with Molicel P-28A cells and each cell is 35A and 2800mah each cell . What BMS with balance should I use , a 40A , 60A or 80A BMS with balance ? So the 3s2p i will build will be 35A both rows 3 cell each in series and when combined in parallel it will have a total of 70A so it will peak at 140A at a max discharge rate the 3s2p battery pack , so at least i will need a 80A bms or a 100A Bms ?

[@wildpitchtv3000]

hi it is possible to use 30pcs 18650 batt to BMS

[@secuestrador08]

You can use a quick charge charger for this pack ????? Like 5A

[@myname2263]

Ive watched this over and over and the way you have the batteries it looks like its touching the pos and neg at the same time ... isnt that a direct sort on the battery

[@donaldgsell1663]

Hi what do I need to build a 20ah 12 volt lithium 18650 external battery it's to run a cellular 12 volt trail camera. And to recharge it. What bms will I need. Thanks

[@richardcherry664]

awesome....thank you for this tutorial video. you made simple and thats what i like.

[@WesThatTechGuy]

Glad you like it and thanks for watching?

[@inmoraa7613]

Great video, how is that BMS holding up? I have been looking at that kind but with the price I have been wary

[@RickyEats]

What size nickel strip is suitable for a 3s6p? Thanks

[@nnejiamaechi9385]

Interesting. Keep it up. What is the ah?

[@shahzebahmad6622]

Great work

[@WesThatTechGuy]

Thanks

[@pavlossoultoukis4448]

Nice video keep up the good work.

[@WesThatTechGuy]

thanks

[@richarddisman8451]

Can you charge this pack with a PWM 12v 7a charge regulator?

[@chris83chevy]

How can I charge something like this? I made 2 3s in series but when I try to balance charger it I see the charging amps are 0.

[@Nowornever72]

Which charge 🤔I have to use for this battery pack

[@julian_online]

Hey, super great video, I'm planning to build a 3S7P almost like yours here, I'm wondering which BMS is better, It'll power a Chicago power systems inverter (92708) which is rated 12V 400 watts. I don't quite understand yet if the battery capacity determines the BMS's amp rating or if it is determined by the load.

[@WesThatTechGuy]

Julián Mauricio Ramírez Obando Thanks for watching! Your inverter is capable of producing about 34 A. And your battery bank average will depend on what type of battery you buy or use. 400 W divided by 12 V equals 33.3 A. The BMS is to protect the battery pack. I would suggest a 50 amp continuous balance BMS. We currently have them in stock at SolarGeni.com

[@rombsfamily1729]

@@WesThatTechGuy Does the discharge rate of the each cell have importance on what the size of the BMS current level should be?

[@TonyHoangPodcast]

With that BMS can you just plug it into any 12v charger and walk away and it will stop charging when it’s full?

[@MolefeWolf]

What charger are you using for that battery?

[@freddyjaviervivarfernandez4828]

What kind tools i Need to build the battere pack ..can you name those please

[@commandant30]

Hello, I have a question regarding this same BMS please, if I want to draw like 15-20Amps, should I use balance wires that can carry this current, or maybe is it possible to use small sense wires and in same time connect a thick wire from the main negative and positive of the battery to the discharge terminals??

[@Pluuton]

EXACTLY this I have in mind right now. What did you do?

[@kayotpatrimonio4839]

can you use and charge this battery pack at the same time by connecting to its - and + terminals. .thk you. .

[@WesThatTechGuy]

Yes

[@AmadiSamuel-zk2mh]

Where will the battery charge from

[@curtokay8046]

what gauge wire did you use

[@kayotpatrimonio4839]

sir gd noon csn i make 3s,10p of 12v using 25amp bms?, t.y.

[@felixmendez6294]

What can you power with that battery?

[@stevekoebernick4023]

Can I get a list to build 12v battery

[@sbollmeyer]

Thanks Wes, you're a pro. Thanks for sharing you're knowledge.

[@sickvic3909]

I have one of these but the 3.7v and 11.1 terminals are on the opposite end as yours. Does it matter which way we position the charger?

[@WesThatTechGuy]

no as long as you configured correct.

[@waynedavis1985]

Please let me know that we can connect the adapter at the same time as well?

[@WesThatTechGuy]

What adapter do you mean?

[@ciprianmesa8804]

Hi how do you charge this battery (you charging trough the main red and black wire or you add a separat charging connector) And what tipe of charger do you use to charge?Thanks

[@WesThatTechGuy]

charge and output to load is on the red and black. pos to the battery and neg to the BMS

[@emmanijoa]

Excellent !! Please let me know for 3S10P configuration with battery ICR18650-28A the BMS How many amps should it be? Thanks in advance and Regards Jose

[@WesThatTechGuy]

Jose, I need to know the application you're using it for? How many amps will you be drawing and charging continuous?

[@emmanijoa]

Good Morning !! Actually, this configuration is for two projects, the first is as a portable starter for cars and the other is to be used as a power bank for a 12 volt mini inverter with a maximum discharge of 3 amps hours. Once again Thanks and have a nice day Jose

[@Civicsir1]

Nice work! I've made one exactly like yours! But how do i charge it using a balance charger? I tried charging it but an error keeps saying DISCONNECT.

[@crazycarl9484]

you cant use a balance charger get a 12.6 volt charger

[@obviouslytwo4u]

what size is the nickel strip that you used here? what voltage and current would i need to charge a 12.6 volt li-ion battery please

[@WesThatTechGuy]

i used standard 18650 strip. you could do 16.6v and 1a-25a to charge this battery.

[@taimoorkhan90]

Very nice sir

[@WesThatTechGuy]

thanks sir

[@starmate230380]

Hi Thanks for your video. Can we use this type of battery to replace lead acid ups batteries?

[@WesThatTechGuy]

If you can match the voltage to the charger inside of the UPS

[@starmate230380]

@@WesThatTechGuy do you mean 12.6v?

[@FM-fn7eo]

enhanced vs balanced bms what's diference ?

[@davidk3177]

I am looking to make a pack that has a rather large capacity. I like the 3s config. Can multiple packs like this be connected in parallel for better storage, or would I just add more batteries to the pack? Thank you for making great quality vids!

[@22koga]

You add more batteries

[@WesThatTechGuy]

Yes, absolutely, but either way works

[@CryianSky]

why my bms 3s positive side 101 chips gets incredibly hot, hot enought to burn fingers if you touch? I have 36 batteries connected as shows in this video. Have tried to connect 4x 3s bms, thinking maby its to high amps for 36 batteries, but still all 4 bms B+ side is frying hot!!! What i did wrong and why is so hot? Dont think it should be that hot. But if this normal, dont realy want to use BMS as i dont think it safe to use them at that temperature! Please need help asap! Thanks

[@WesThatTechGuy]

this is a cheap low power bms. Its says 100a but can really hold that continuous only for a few seconds.

[@ClassicD1]

What charger voltage is required, 25.2V or 29.4V? I can't seem to get a definitive answer to this, both chargers are available but what one is best ?

[@WesThatTechGuy]

12.6v charged. It has been listed in the comments numerous times. It's neither of the 2 you listed. Its a 11.1v nominal and 12.6v charged. you need a 3s (12.6v) LI-ION battery charger.

[@NJFPV]

Thanks for the video. I would want to connect a balance lead to the pack. Is that what the regulator you installed is for, or is that for strictly discharge regulation? Thanks.

[@22koga]

Most of those boards have it on it already you just have to read the description of the board

[@WesThatTechGuy]

its a BALANCE BMS

[@jasonpocklington9217]

I did what I see and connected the Circuit board and on connecting it it became very hot so disconnect it now I’m stuck

[@ianwhiteley964]

Hello Sir, as asked in a previous question, do you know why my 3s BMS gets red hot to point of burning my fingers, all wired just as you have done, as a temp measure I have cut all nickel strips off and await your reply please? many thanks,

[@WesThatTechGuy]

ian whiteley Generally if the bms gets hot and it’s new it’s because you’ve wired the positive leads wrong and then plug it in. You’ve got to be sure to get all the proper positive leads to each group of cells. test the pigtail with a volt meter at each point you should double your voltage if your voltage does not double all the way up to your required voltage then you connected wrong. If that is all correct and still getting hot you probably have a bms issue. Is it hot when you just plug it in or does it get hot after you ran a load through it?

[@ianwhiteley964]

@@WesThatTechGuy Very many thanks, now sorted,

[@WesThatTechGuy]

@@ianwhiteley964 You're welcome.

[@ponkuna]

Nice instructional video.Good job. I am just learning. .I made a 4s 1p and connected to 12V 5W led light and light burnt away in one min. I did not use any bms. Then I made a 3s 1p and connected another led 12V 5w It worked but not too long. It droped the brightness. For my 4s, if I would have used a bms would have I avoid burning the bulb?

[@WesThatTechGuy]

thanks kuna! the light burnt out not because of no bms but in 4s it was running at 16.8v and your light is a 12v light so the over voltage most likely made it burn out. at 3s it's 12.6v charged so will be good for a bit but will get dim as the battery drains. to run a 12v light on a 4s battery pack you will need a DC buck converter or a way to reduce the voltage from 16.8v to 12v continuous.

[@ponkuna]

Wes That Tech Guy Thanks. I understand now.

[@elyasjan5968]

is this charging for solar???

[@realhuman23]

@@elyasjan5968 yes.

[@sinisabraz7482]

Great

[@jakeeames725]

QUESTION: if you want high amperage AND capacity in a “performance” ev how difficult would it be to have a secondary battery pack that has a high cdr compared to a larger high capacity pack that you use for every day driving? Like if you put your foot down or went up a hill the higher amperage battery pack takes over when there is a higher current demand? Looking into using a model s drive unit in a e30 bmw. Just a newbie doing internet research and throwing ideas around. In theory would like to use a large pack of Panasonic NCR18650BD cells for capacity and a smaller “turbocharger” pack of something like Sony VTC4 cells for current. Any information or feedback or more info on anything like this or diy batteries or tips and tricks or whatever would be greatly appreciated. Thank you for your time for anyone reading this!

[@22koga]

I think what you are talking about is in whats called the hairball or controller for the motor no matter how many batteries you add if thats not modded it wont ever go faster then what its set at

[@genepierson1728]

Thanks for sharing, what's the capacity of this pack?

[@WesThatTechGuy]

20ah

[@aarav2068]

Can I charge with monitor adapter 30 w 🤔

[@aarav2068]

14v 2.14amp

[@WesThatTechGuy]

NO! you need 12.6v charger ONLY!

[@koreano9923]

sir what amps and voltage your build in that video? thanks

[@WesThatTechGuy]

200a, 20ah and 12.6v

[@johnnybuoy9551]

a few questions.. I might sound being dumb.. 1. Where do we supply the Input power to charge the 18650s? and How many Volts do we need to provide? 2. If the answer to my first question is "P+ and P-" then from where do we get the output power? 3. How many Amps max can we get out of this battery? What are the factors that determine the Max Current output?

[@WesThatTechGuy]

you connect all pos. loads to the batteries + terminal the all the neg. loads to the BMS' - terminal. this battery can output 200a. this is done by calculating 8p x 25a = 200a

[@kmuralikrishna1582]

Need 48v40ah for ebike for 50km range can we get 50km range per charge of we use 48v40amps ...?

[@WesThatTechGuy]

YES

[@darrenjackson6207]

Hello, I have 4 12v 10ah Lifepo4 Dakota Lithium batries wired in series which charger is best for my battries that you sell.Thanks

[@WesThatTechGuy]

you would want to get our 16s lifepo4 charger. You could get by on our SolarGeni 5a S120 or our 15a C300.

[@JasonEllingsworth]

does the bms board thing balance charge the cells?

[@WesThatTechGuy]

yes it does

[@zrinkobarnjak9952]

Sir Can I charge it with 15v 2A ac adapter, or I must have 12,6 2_3A

[@WesThatTechGuy]

NO. you must use only 12.6v MAX with CC/CV you can use any amperage under 50a

[@145.]

nice video man can i ask you where do you get the cell holders? thanks in advance

[@WesThatTechGuy]

Those can be found on Amazon, eBay and many other places. Just search 18650 battery holder

[@145.]

@@WesThatTechGuy Okay thanks man very appreciated

[@standbyme6395]

Make sure the bms is rated for over your packs ah. Made a pack and I'm 3ah over board rating and it causes the board to not function correctly.

[@ARepublicIfYouCanKeepIt]

Peak amps (current), not amp hours (energy capacity).

[@standbyme6395]

@@ARepublicIfYouCanKeepIt I have to disagree with that. Could be the board I have but my load is not even an amp. My pack capacity is at least 13ah. My board is a 10a and the output shuts down when load is turned on. I've tried 2 identical boards and both behave the same. I've got some 100a boards coming that will hopefully solve the issue.

[@baIuch]

How to charge it Sir?

[@gilbertobispo6372]

quantos ampére é a placa BMS 3 S

[@iamnikhilattri]

What about its charger?

[@mkbman45]

How do you recharge this? I built one exactly like this and can't get my charger to accept it. Isn't it missing a balance lead?

[@johnreyfrancisco4373]

By using 12v charger you can charge it

[@WesThatTechGuy]

balance leads are directly soldered to the pack. watch closer. 12.6v CC/CV charger Li-ion only

[@swimwithcoachraven1532]

Multiply the amp of each cell by the row. Current is the same so get the nearest amps for the bms

[@socrates_the_great6209]

Context?

[@swimwithcoachraven1532]

@@socrates_the_great6209 bms rating

[@KhataarFelMataar]

Nice vid but how do you exactly charge this thing up?

[@E85_STI]

Since it’s a 3S you use a 12v chargesr you can find it on Amazon and just be sure you get a charger that can handle the amps so what I use for my battery I built like in the video is my imax B6 mini charger.

[@Nowornever72]

Can I charge this battery 🔋 by 12v 2a adapter?

[@WesThatTechGuy]

NO! You must use the proper lithium ion charger. Your 12V charger will over charge it and destroy it.

[@ankamanirudh8837]

How you charge the battery pack? I mean rating

[@WesThatTechGuy]

12.6v and up to 25a

[@nissanlord]

which spot welder are you using?

[@WesThatTechGuy]

Sunkko 709A

[@nissanlord]

@@WesThatTechGuy I was looking at the 709AD , no foot pedal needed it says

[@achinto5027]

Can I charge with ups circuit...

[@WesThatTechGuy]

as long as its 12.6v and 25a or less

[@alitaha2537]

هل يمكن اضافة المزيد من البطاريات لزيادة الامبير حوالي 25a كم يصبح مجموع البطاريات على bms3s؟

[@robertklusty7907]

How many Amp hours does a battery like this provide?

[@WesThatTechGuy]

This little guy is only 20ah

[@johnreyfrancisco4373]

Sir how many 18650 batteries i can attache on that kind of bms?

[@WesThatTechGuy]

as many as you want as long as you keep it 3s. you could do 10000 in parallel but must say 3s for this BMS

[@johnreyfrancisco4373]

@@WesThatTechGuy thank you sir

[@jimismisirlis8581]

hi this battery can use fro rc ?

[@WesThatTechGuy]

yea if the voltage is the same

[@williamsteendam3464]

if each 18650 is 2500 mah then would it not be a 6 ah battery instead of a 20 ah battery as stated ?

[@orange11squares]

8P is 8 parallel , that is 8 x 2500mAh = 20Ah

[@joeeoj5715]

How much capacity will it have when fully charged? Thank you😊

[@WesThatTechGuy]

20ah

[@joeeoj5715]

@@WesThatTechGuy I mean mAh

[@davidk3177]

@@joeeoj5715 1000mAh is 1 Ah, so 20Ah is 20,000mAh.

[@joeeoj5715]

@@davidk3177 Thank

[@ponkuna]

I bought a 4S 40A BMS. My question is for 40A, how many "p" maximum I can have in this 4s pack?

[@WesThatTechGuy]

this can be infinite amount of batteries in P (parallel). you just cant charge more the 40a or discharge more than 40a.

[@ponkuna]

Wes That Tech Guy Thanks. You are one of the few guys who answer to learners. Great! But still I need more advise. “”Charging not more than 40A”” . Can you please break this and tell me in simple words? Can I able to BUY your one hour online video hour to get trained in my week places. I will pay you before the training? Please do not misunderstand me.

[@ponkuna]

Finally you have wrapped the cells with a yellow plastic roll. What is the name for it and can you please give me the link to buy? Thanks.

[@WesThatTechGuy]

kuna, thanks. Yes it is best to learn and understand the safety of the battery and BMS and balance charging etc. Yes you can do the 1 hour consult with me no problem. Just let me know. You can do the order on the website and we wil schedule it whenever you would like.

[@WesThatTechGuy]

this is called Kapton tape and is used in electronics to protect against shorts etc. heres a link for you. amzn.to/2Pvf1Jq

[@hussainsain747]

sir please tell me the charging time for this Bettry pack

[@WesThatTechGuy]

depends on how many amp charger you use. the higher the amperage the faster the charge. At 10a an hour or 2.

[@obviouslytwo4u]

@@WesThatTechGuy what volts would one need?

[@wessamshehabahmed7666]

how many Battery can i parallel to Using the 3s 40A BMS Board

[@WesThatTechGuy]

Wessam, It depends on what the ah/mah of each battery is. If they are 2000mah/2ah you will need 20 in parallel.

[@wessamshehabahmed7666]

@@WesThatTechGuy thanks

[@WesThatTechGuy]

YW

[@WesThatTechGuy]

Your Welcome

[@AmitKumar-es8pr]

How many parallel 3s cells can i connect to this BMS

[@WesThatTechGuy]

As many as you would like

[@aseemparambennykukkarlive4501]

ok that is awesome but how would I charge it

[@22koga]

The same wires you use to discharge it

[@sabbirahamed3183]

How do you charge it ??

[@WesThatTechGuy]

solargeni.com/12.6v-3s-5a-lithium-battery-charger-tesla-power-wall-s120

[@smartcookie_ibrahim6936]

Can I connect to step up booster to laptop

[@WesThatTechGuy]

Yes you can

[@anthonyhall9211]

why make everything so permanent. what if you want to replace faulty batteries ?

[@technicalsabaa6055]

12v 18650 bettery help me plz give me

[@tech_ji_solar_electronics]

Bro please make 12v 50ah battery in 32650 battery

[@SuperVstech]

I thought 3s packs were near useless for backup power... too low for 13.8 float, too high for inverter use... the bms will keep the pack safe I guess.

[@WesThatTechGuy]

This is just one of many ways to build a battery pack in series with a BMS. You can do 4s-16s no problem and then some. Just repeat the steps from 3s to infinity etc. Also inverters are changing everyday so these things can be achieved easier now. That said in my opinion 4s is still the way to go for a 12v system rather than 3s.

[@stefanogiannini4508]

It's not completely true, the 13.8V drop immediatly at 12,60V or less even with small loads, so the 12,6V of 3S battery are good. The problem is that the commons inverters have a range from 9,5V (stop working)/10,50V(acustic signal starts) - 14.8V, so 3S is a little bit less than 14,8, but 4s are a lot more than 14,8. The best thing to save money is a 3S battery pack, if you disable acustic signal you can use about 80-90% of battery. The best thing for life cycles of batteries is 4S, but you need to buy more because you can charge a lot less than 100%, but discharge completely

[@albread]

Do you sell them?

[@WesThatTechGuy]

YES we do! SolarGeni.com

[@hendyvidio7874]

Bang kalo 1000mah itu berapa amper dan 2000mah berapa amper Dan 3000 berapa amper mohon di jawab

[@technicalsabaa6055]

hey bro help me plz 18650 bettery give me

[@hailtothekingbaby100]

What can I use to charge it with?

[@WesThatTechGuy]

12.6v li-ion battery charger you can get here: solargeni.com/12.6v-3s-5a-lithium-battery-charger-tesla-power-wall-s120

[@nickkowalski7979]

Soldering lithium ion cells can damage the internal separator within the cell and is not recommended