Build 12v LiFePO4 battery Packs the Easy Way

[@ajemohaltom3560]

A relief to see this battery chemistry with an easy to use BMS.

[@paulcurtis5496]

Dream come true, I'd love to see a 48V pack. I'm going to eventually need 12Kw storage in 48Volts, but I will need to add packs over time so I can pace the growth.

[@SuperMIKevin]

I am overjoyed you started making a phosphate battery system. Thank you!

[@gsama9817]

Love the fact that I live in CA and can get the battery 🔋

[@DavyOneness]

Glad I bought a bunch a couple days before your video, seeing that the video sold them out.

[@korneliusthegrey4923]

Awesome video. Thank you. Very well done. I'm going to start building batteries.

[@adam_clay]

this is exactly what ive been waiting for

[@mortyrickerson6322]

thanks for sharing! How has your week been Jehu? Hopefully well, glad to see u posted!

[@haciendadad]

Wow, you could not have made this easier! I'll be making a purchase soon if you have some for 18650 Li-Ion!! Thanks bud!

[@thesonie]

These came in works great! Thank you

[@Brant_Channel]

Hi Jay! I just received my kit, but i can´t found the BMS specification. Do you have it? At least the maximum charger voltage.

[@Brant_Channel]

I think I found the information. Let me know if it´s correct: Continuous operating current: within 50A Instantaneous operating current: 800A Charging voltage: 14.8-16V Charging current: 30A (Max) Equalizing current: 40mah Overcharge protection voltage: 3.75V per series Overdischarge protection voltage: 2.0V per series Short circuit protection: Yes Applicable to Lifepo4 3.2V

[@lnxpro]

the prices are messed up on the site. it's cheaper to buy 15 separate boards plus one bms board than to buy a kit. where's the incentive to buy in bulk? lol

[@pederb82]

Jehu: nice design! I like it.

[@David-ql1hd]

How would this battery pack perform vs. a 12v deepcycle or auto battery?

[@sinusshephard5314]

I want to build a 12v battery to run 2 small amplifiers on a motorcycle.each amplifier has a maximum current draw of 35 amps.I’m wondering is there a way to build it so it can charge off of the motorcycle or make it removable and charge.

[@mycallofduty91]

How about camping battery pack any recommendations

[@MitchMartinEngineer]

@jehugarcia, you should look at putting that fuse horizontal in the next board revision. would make it much easier to replace in the future. What material are those standoffs? Have you measured the resistance of them? Have you thought about going to a mating connector instead of electrically connecting the boards via the standoffs? Without loctite, I've had those type of standoffs loosen up pretty quick with any sort of vibration.

[@peterhill9360]

Probably brass. And not a good method for interconnecting the boards due to the reason you've mentioned. Fairly low resistance (probably around 10m ohm) starts to add up quite a bit with large stacks. 50A (BMS rating) or anything beyond about 10-15A would be worrisome.

[@onekewlbraddah8460]

I wish I could do this to build my own V Mount Camera batteries!

[@WaterCoolFool]

I am tryin to build a Bluetooth speaker. Would I just get the 5 boards buy a BMS. Would the battery be 15amp ?

[@sachinfilinto]

Nice. is there a way to know if one of the board's fuse is blown. given the other parallel boards will be powering up the BMS (with lesser current capabilities ) it could go un-noticed for a long time.

[@jehugarcia]

Visual inspection

[@sachinfilinto]

@@jehugarcia would be great if there was an indication that one of the PCB is knocked out of the parallels bank. can also be a case of trace fuse blown / loose battery / spring / poor contact / etc.

[@gregyohngy]

You can purchase mini fuses that glow with an LED when blown.

[@recoblade1465]

Would you possibly make the Gerber file available for these I have a bms with temp sensors I would prefer to use

[@ebikeengineer]

I'm liking this idea. Does it recharge by putting 14.4v across the power lines (like a standard automobile battery)?

[@KnowThyZomB]

I want to know his 12v recommended charger but can't find a video which he picks one

[@matthewknight5641]

Sir I know you are busy but you are more educated on batteries and bms than anyone I know of. I have a bunch of leaf cells I'm trying to use and I need a recommendation for a good bms for them. I have 24 wired in a 24 volt configuration and I'd buy a few bms to get it up and running safely bit I need advice on what bms to buy. Any help is greatly appreciated

[@TheFunkyfresh3000]

I build the," Build 12v LiFePO4 battery Packs "' , I am not sure on how to charge the unit. I was going to use it to power my 12v boom box build. I think I know how to charge it I just would like to be sure. Can you explain?

[@jehugarcia]

Just connect a 12v charger to it

[@RickyEats]

What other batteries can I use

[@frugalberry]

Can these be used for 18650 batteries with a spacer underneath?

[@jonathan1976xxx]

You Can get 18650 kit the same

[@DavyOneness]

Link for that capacity tester you used in video?

[@gioarteaga3984]

Quick and ez bro 👍 good job ...

[@ogiejii7885]

No longer available? The link for the kit directs to T shirts.... I don't need T shirts.

[@saglazier]

If I did the 15 s configuration with 60 total batteries you recommend (the new ones) how many Watt hours would my total battery pack have at the end as a 12 volt battery pack. Not sure how to calculate that. Thank you.

[@jehugarcia]

3.6ah x 3.3v =11.88wh per Cell x60 = 712wh

[@rasboy342]

712WH or Approximately 59AH, for that price it is very expensive to build that battery. WOW 😳

[@saglazier]

@@jehugarcia thx for your quick response.

[@howardrfrank]

So if I want to build a 60Ah 12v battery to power a trolling motor for my kayak, is this a good solution? How many of these do I need? Not quite understanding explained math here.

[@Nordic_Mechanic]

Is there any type of BMS / charger that we could put any SOC cells in them and would balance them on first charge?

[@Mach1n3gunn3r]

I bet that would be great for a HAM radio!

[@UltimateEightnine]

How do you charge it?

[@kennedylangat8369]

Looking forward to building one soon, but I don't know where to get these components

[@atc576]

What am I going to use with that type of connector? Can I change the connector type?

[@joaquimaraujo544]

Hi Is it possible to make a battery of this kind, powered by solar panels to charge an electric car?

[@patrickahn8168]

Gerber file for this 4S battery holder?

[@diasporasierranetwork6158]

Going green 12v 👍

[@TheMrjogas]

Hi If battery leak does liquid from lipo very dangerous when it get on skin.any experience on this case.thanks.love your videos

[@ivanluhi]

Great packs! Are these safe to use instead of an AGM in a UPS?

[@ca5ualm3dia]

do you have these for lipo 18650s , I dont think my lighting system will work with these as well in a 4p3s config ?

[@tonyjesshope6861]

Can you ship to UK?

[@ralmodo58]

Cn be used on serial to make a 24v batery?

[@jehugarcia]

Yes

[@garydudelston]

I would never use the 26650 bty. They are rebranded 18650 cells packer into the 26650 case.

[@richardduke9788]

Looks great 👍

[@G7MJV]

Is it possible to get hold of the boards ( without batteries ) in the UK please

[@jehugarcia]

Only if you order parts and build them yourself

[@G7MJV]

@@jehugarcia That's great, am I able to order the PCB and battery holders direct from you

[@G7MJV]

Just tried to order the PCB but it won't ship to the United Kingdom.. shame

[@LA-Creative]

I love this. I need a small s4 x 1 like this for small solar power device. Are these batteries good for solar? Also does this need a bms (if you are only grouping 4 batteries)? If so do you sell the bms? Thanks!

[@rodsjohnson831]

Can you use these in series to make 48v?

[@handyhippie6548]

so what's the spread of mah capacity you can use for a battery pack? so far i haven't found a definitive answer anywhere.

[@jehugarcia]

He less spread the better

[@handyhippie6548]

@@jehugarcia i understand that, what i am asking is how much is too much? i've been rebuilding tool battery packs, and i reuse the good cells and bms, and replace the bad. but i don't know how much difference in capacity i can put together in a pack. i've been trying to stay within 3-400 mah, but is that too much, or can i use a greater difference in capacity? i want to try to stay within the rated capacity of a given pack, but it's not always that easy with used cells.

[@jehugarcia]

300-400 = 11%-15% on a 2600mah cell. That’s too much I’d say no more than 5%

[@handyhippie6548]

@@jehugarcia thanx! i really appreciate the advice. i've learned a lot from your vids, and have been subbed for years. keep up the good work, and i'll keep watching and giving you the thumbs up!

[@michaelandrew83]

Could this be used for a motorcycle battery replacement?

[@jehugarcia]

It can be used for anything as long as it meets the power requirements

[@michaelandrew83]

jehugarcia incredible! So if I need to make a 4-8ah 12v battery I would need to buy 12 cells and 3 boards and 1 BMs?

[@ripsta2009]

well depending on the capacity of the individual cells. if its 2000 mah per cell then to make 8 ah you will actually need 16.

[@michaelandrew83]

scott moore thank you for the reply, I think for a motorcycle battery I only need 4+ ah. I want to build one. I wonder if my motorcycle will charge this

[@ripsta2009]

@@michaelandrew83 I advice doubling what you need so if it 4ah then go with 8ah. You will have a small draw no matter what so you want to compensate for that. And if your motorcycle charges anywhere around 13.5 it should be fine.

[@christopherNadarajah]

anybody see the link the the SOC cable ?

[@ssyoumans]

Any plans to make these cell holders for 32650, which have 5000-6000 mAH?

[@jehugarcia]

No

[@hongmaihaosterstrom8091]

@@jehugarcia Too bad. I have around 150 cells so I could use about 30 kits.

[@hongmaihaosterstrom8091]

Also a bunch of 32700s but that's an even worse project!

[@melangiehayden4167]

Will the boards work with 26650 battery as well as 18650 battery??

[@jehugarcia]

These only work with 26650

[@melangiehayden4167]

@@jehugarcia copy that. Also how do you determine the number 5 amps from a four board 26550 stack? I ask because I want to build a 100 amp battery. So to use your big pcb, I need four stacks with five small boards in each stack? Is that correct?

[@MindMeetMaker]

There must be a limit to how many pcb to one BMS as each level the cells are parallel i.e. cell 1 of all levels are parallel to the BMS and the balance resistors are normally very small so if you stack to many boards it will never balance quick enough and a single cell could over charge or trigger Over voltage or am I missing somthing here?

[@jehugarcia]

That’s true, especially if the cells are degraded the self discharge rates will be larger so smaller groups of cells will saturate the bms

[@Shmade0304]

Your the best🙌🏽🙌🏽🔋🔋🔋

[@olagunjubose2483]

How can I get this pack board In Nigeria?

[@faditarapolsi2898]

What is the aH per board?

[@isaacgonzalez3260]

Hi Jehu how can I get just the pcb board?

[@eddiekytia]

So the link for new batteries are for 3200mah so if I made 4 stacks with a bms how many true amp hours would that make of a 12v pack. Hope I don't sound stupid I'm just learning about batteries. I'm guessing 3200mah x 4= 12.8 ah with 20amp max output?

[@MattLesak]

Why not make 4P packs instead of 4S?

[@eddiet3026]

Because you would end up with a 3.3 v battery. When you wire them in parallel, the voltage remains the same, but the capacity increases. Wire in series, the voltage increases, but the capacity stays the same.

[@makdady66]

Hi I'm new to all this, I would like to build a solar system to power my home can it be done with this battery system???

[@ripsta2009]

it can but it will be a huge endeavor. there are better batteries out for solar than these.

[@makdady66]

@@ripsta2009 can you please give me an idea if possible..

[@ripsta2009]

yea angel r look into prismatic cells. i just did a 24v 400 ah setup in Hawaii.

[@kbwfgg6400]

I am looking into getting your kits. I need two 12v, about 33ah or more blocks to replace the UPS gel cells that are connected in series. So. it looks like this UPS is using 24volts. Do you have to pre-charge each battery before testing it? If they are not charged initially, how would you know that they reach the same level of charge? So, I can build 5 blocks high to get 18.5ah per unit? Connect two units together in series to get 12v at 37ah per 10 of the boards using one bms? It looks like though, that the bms has only 5 lines (the ribbon) going to it, So how do you use one bms for 10 boards?

[@AlexandreLollini]

You can't stack like crazy : the brass standoffs are a limiting factor : I think a maximum of 8 boards, or 8 boards on each side of the bms can be safely used. 8 below and 8 on top. and that will be heavy enough for an unit to manipulate. With the li-ion 18650 7S I do stacks of 14 with the bms in the middle. I have tried more but measures from the top and middle do not match, so this means that voltage sag can tax more the middle than the bottom or top and then you do not use each cells the same amount, making then age differently. Better limit the max stack for the brass standoffs.

[@jehugarcia]

True, but on my builds I spread the bms modules along the entire stack, that way you remove power from more than a single point. I have stacks of 40 boards running no problem

[@AlexandreLollini]

@@jehugarcia how many boards are you putting between two bms ? Also it is important to use bigger conductors each time you jump one level in hierarchy. example XT60 between boards, XY90 between packs, and 25mm2 to the inverter, etc.

[@arpir97]

Never use BMS in parallel. Paralel them only when they have the ability to synchronize with each other !!!

[@justanpayne8748]

Is there a kit for 21700 battery's

[@jehugarcia]

kzbin.info/www/bejne/e2naen1tipmKm5o

[@Xfactorr6]

What do You recommend batteries wise that you sell to build a 72v battery for 3000w bike?

[@jehugarcia]

2 scooter packs in series

[@joelrampersad1359]

Build a Tesla Powerwall competitor. You know you can.

[@karlInSanDiego]

First thought seeing those cells is dynamite. I know that's ironic because the chemistry is safer, but they definitely remind you of fireworks.

[@G5Ckxew]

I'm glad I wasn't the only one

[@pederb82]

The problem with this kind of cell is that voltage does not tell state of charge. You can saturate an cell at 3,45v to 100% and its full even if not charged to 3,65v. So an BMS has a really hard time balancing them. A cell can be absorbtion charged at a lower than max charging voltage all the way to their design capacity - it just takes a long time.

[@SirValak]

I add an active balancer to my packs it works well

[@DavyOneness]

3.65v is what it hits during charging, when the charger shuts off the voltage always settles down. If you measure the internal resistance of the battery, that can tell you if it is charged or not also, better than the voltage

[@199515Danny]

I need a device to test the state of the battery, to know if its condition and useful life and if they work or not. Someone recommend me something to break them????

[@ripsta2009]

only way to truly tell is test them with a load. a simple battery tester and a cheap isdt battgo will do the job. lithium can still hold a charge and be absolute trash as far as internal resistance

[@billmarles5665]

Not seeing kit you assembled

[@brokencage9723]

looks cool but the price is mighty steep. I can buy a 100 AH life po4 battery with 10y warranty for less than just these empty packs. what am I missing?

[@jehugarcia]

That you are asking an American to build you something, Chinese labor is cheaper

[@SuperMIKevin]

Please please please remember to talk about or show an example of the chargers we should use for those batteries. Or If we can charge phosphate batteries with regular lithium battery chargers.

[@ripsta2009]

get a dc charger it charges up to 30 volts and 10 amps its variable.

[@SuperMIKevin]

@@ripsta2009 will any DC charger work for Li-ion and LiFePO ₄? i have been assuming that specific chargers are needed for specific battery chemistry.

[@ripsta2009]

no only thing that is needed is proper voltage and current. I am talking about the dc power supplies. they are great if you work with different voltages and chemistries. if you work with lower capacity batteries then a icharger or tenergy works great as well. when I charge larger capacity cells I use a regular car charger to get them up to the max the charger will go and finish them off at 14v with one of my other chargers. the other 2 will balance charge up to 6s. but i parallel charge them usually to keep them balanced.

[@ripsta2009]

I have and do work with all kinds of chemistries and all kinds of applications. built batteries for boats, motorcycles (harleys), vehicles (got one in my comp vehicle right now only battery in it) solar, camping power supplies, and 12,000+ watt competition vehicles with massive draws. I test every cell to its max and the ones I have tested I can tell you c rates they have reached and safer c rates and I videotape every test and watch every cell's voltage variations. For example I can tell you 32650s will put out 14-15c and have video tape to prove those claims. Though I wouldnt build a battery to do those c rates all the time.

[@edwardcdg]

I like this!

[@herbertwerner2287]

Would be nice if you talked about something that was in stock. Its a great product if I could buy one it would be great. But its a no go here.

[@jehugarcia]

If I talk about it, it sells Out

[@tscotom]

to be sure, not Hand but "Finger tight" !

[@FullSendPrecision]

16s version would be nice to have!

[@yolo_burrito]

I’m pretty sure you could connect 4 PCBs in series but you’ll need 4 BMS and you can’t stack them.

[@williamsrdan]

Does it come in 24v? Do they work with an active charge system like solar panels? (I have an mppt charge controller, 40A, getting up to 35v; currently on 12v, but that struggles to keep my laptop powered while editing video or gaming, so I'm thinking about upgrading to 24v)

[@ripsta2009]

no but ya should be able to wire them up to 24 volt. basically like ya would a car battery.

[@CET675]

is there a kit for 16850?

[@jehugarcia]

Yrs

[@earthboundmisfit7654]

Sweet

[@Robert-cd2ht]

Jehu, why are you so rough handling the electronics?

[@jehugarcia]

No

[@damagedtalent]

If these ship to Canada I find something so much.

[@scottsexton4839]

Is the BMS Bluetooth capable?

[@jehugarcia]

No

[@ovchannelag5238]

👍👍

[@maxxearth]

Damn, sold out already.

[@craigr306]

you put them in the wrong way everybody's a critic

[@rasboy342]

$589.17 dollars for a 59ah 12v LifePO4 battery, I consider is a very high price and it is not worth it 🤔🤔🤔

[@DavyOneness]

2000 charge cycle battery though, last way longer and cheaper than buying and changing out 4 lith ion battery packs every 500 cycles

[@DavidHalko]

Being able to easily change out any single battery without breaking solder welds is the major advantage.

[@DavyOneness]

@@DavidHalko I'm using these boards to recondition and evaluate salvaged used lifepo batteries before committing them to more permanent battery packs

[@derKopp]

use gloves for transmission work ;-)

[@jehugarcia]

I was degreasing parts, gloves melt with solvents

[@theMekanik]

1st!!! 🤘🏻😎🤘🏻

[@muhammadmubeenislam]

Jay, do you chew your nails? 🤔

[@arturcapital]

I was thinking the same thing. "Where is this dudes thumb nails?!" 😆

[@muhammadmubeenislam]

@@arturcapital 😂

[@jehugarcia]

@@muhammadmubeenislam no, I have people that do that for me

[@romandise]

what happened to your nails bro?

[@bentheguru4986]

Nice boards but far from space efficient.

[@DavidHalko]

When he stacks the boards, there is no visibly wasted space between the boards, with the 26650 battery holders - so there is very little wasted space. I am impressed with the design!

[@rustusandroid]

My god, what's wrong with your fingernails?

[@AJBtheSuede]

I can't remember the last time I clicked on a video from this channel and found that it tried to do ANYTHING else than sell something. Educate, entertain, ramble, test.... Nope. Only sales pitches. I miss the VW van, that was huge fun :) Unsubbed....

[@DavyOneness]

It was helpful to those of us actually building stuff, and not just watching for entertainment value

[@jehugarcia]

What a scumbag, 2 of the last 4 videos don’t push any product. one kzbin.info/www/bejne/mJm6eWejfNRkfpI and kzbin.info/www/bejne/bWm8f6Bobr2Hd80 but that’s all right you were always a terrible subscriber anyways so good bye.

[@DavyOneness]

@@jehugarcia Don't mind the haters, you do you and keep up the good work :) These "products" and videos are helpful, thank you

[@AJBtheSuede]

@@DavyOneness Well, good for you then :) I tend to like videos that inspire you to actually build something (which I do quite lot btw), which is something I miss here lately. If I need purchasing inspiration - there's always amazon et al :) Just my opinion, you do you!

[@AJBtheSuede]

@@jehugarcia Just expressed my opinion, that I like third party product opinions (which there are plenty of) better than self marketing - never mind! :) Best of luck to you, really - I understand that you need to make a living too. Had lots of fun here, a long time ago.