How To make a 72V eBike battery capable of 1800W continuous

Scooter Batteries j35.us/ScooterPacks
Arduino Controller - jag35.com/products/for-arduin...
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FAQ:
1) Where can learn more about batteries? j35.us/DIYlithiumBatteryBook
2) Where can I buy Lithium Batteriesjag35.com/collections/lithium...
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6) What parts do you use on your Samba? kit.co/jehu/the-electric-samb...
7) Why not use Supercapacitors?
A. Batteries work better at this time, caps are rare and expensive devices that are very good at doing things not needed for storage systems typically.
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[@ethansgarage7627]

I’m building a 72v ebike that draws 40a. It’s cool to see you talking about ebike on your channel!

[@msotolopez]

That sounds really great, I’m fairly new to these Ebike. Im trying to salvage an electric sport bike which originally used lead acid batteries. I purchased a set of these scooter batteries and a charger to go along with it. How do I now go about connecting them to the bike?

[@albialla3479]

Can u tell me how did that go. Because im doing the same

[@pyronmasters]

I now have a totally new respect for the hard work that you do, about 6 months ago I bought 10 “28.8v” ($29.99) medical battery packs from battery hookup (bigbattery doesn’t ship to PR), it’s a pain to harvest cuz all the cells a glued to the pcb’s, can’t use them as 8s cuz both my inverter’s trip (overvoltage) thank you for the work you put into making these videos as simple as possible.

[@bluezzer1]

Jehu, the MOSFET voltage is important in their off state. When on there is very little voltage across them (like a physical switch/relay). So the battery voltage will have no substantial effect on how much current, therefore power, they can dissipate while on.

[@loranti1]

*Works great my **Latest.Bike** I have a bad knee so I still get exercise but the bike assists me. I am a big guy so I didn’t think it would go as fast but it works great.*

[@littlephilo585]

Explosions are always a Bonus!!!!

[@aaron092000]

Amazing stuff! Comment for the algo, but I wouldn't call a 72v battery with 1800w continuous "high performance" lol. I'm currently making a 72v battery capable of 10000w continous and 18000w peak, now that's high performance lol

[@brentonbowers5096]

Awesome stuff Jehu. Do both open and closed. For eMoto purposes most definitely and is what a lot of us around the world are keen on. Specially for dirt bikes

[@specialred3112]

This is perfect. I am planning a moto with 72V+, so I find this very interesting!

[@msotolopez]

How would you go about charging 2 or 3 of these batteries packs at the same time?

[@specialred3112]

@@msotolopez I'm not there yet, but I am planning to find a charge controller with quick charging capability.

[@chris98o1]

I think it's time to revisit this project with a video of higher voltage, this does answer questions for me

[@marthamryglod291]

As far as I understand battery packs, you can series connect these after the BMS to deliver 72v to the load. You will then have to charge each independently of each other as 36v power packs.

[@int53185]

I series connected six 11.1v lipos to drive my 72v 3000w ebike. I have temperature probes on each cell and current monitoring with voltage monitoring. 50 amps peak discharge the pack temperature never exceeds 50c. I balance charge each cell individually after a ride. Great performance and a 20 mile range. And 1/5th the weight of a LiOn pack.

[@Calthecool]

The whole point of balance charging is to charge all the cells together, so they don't get out of balance. Before I understood why you are supposed to balance charge lipos I was doing something like your setup (3s 2p with 4s lipos) and two of the cells puffed up like a balloon and got real hot. Unless I'm misunderstanding something your setup is probably damaging your batteries.

[@int53185]

@@Calthecool I always balance charge the cells individually to prevent damage. 5.0 amp charging rate. I supervise when charging to avoid fires.. No bulging or damage after a year of cycles.

[@Calthecool]

@@int53185 Well dang, I guess that works.

[@thecrazykartbyAJ]

Very nice video man, greetings from Spain.

[@msotolopez]

Definitely very interested apply such equipment for the use in my 72v 2000watt electric sport bike. Just purchased 2 of these battery packs, any suggestion as to charging them in paralell?

[@Seven-ff8vr]

I have several lgmh1 packs and have series the packs with mixed results. I have played around with 108v nominal 3000w inverter, pushing the 3000watts out of 3 packs the bms will overheat and shut down but you could add more packs in parallel to accommodate for the load. The problem I've had is charging the packs if you have some clever switching you can drop the voltage back to 36v for charging but you cant use the packs and charge them at the same time. If you try to charge the packs in series solving this problem the bms will trip out do to over voltage.

[@dfuentes420]

Jehu... well I would expose them like you proposed the packs to see the mofets temps and make them 3pack bundles.

[@HostileHST]

The batteries themselve are not seeing (affected by) 72v, the inverter is due to the series connection tho. As far as each pack goes, they just put out there usual voltage and thats all the mosfet will be affected by, not by them being in series. As long as the mosfets are not exceeding there rated use (amps), they will never use (voltage wise) anything other than what the single pack puts through them (41 volts). So it's 100% safe to use this in a series connection, but after nearly a year, I'm sure most know this by now. Before I'm hated on, charging them is another topic, I am only talking about while in use. Edit: I forgot to say how great these video's are, so please know I'm not hating. I am saying Jehugarcia is giving excellent information for all who are learning and love how he takes the time to do these type of experments for us all to see. Excellence again Mr. Jehugarcia!

[@ianmangham4570]

Question please, can i individually charge one similar to this from hoverboard using them for an ebike 36v charger 2amp green /red light grey plastic standard version? Thanks and happy new year 🙏🇬🇧, I'll charge individual "if charger works" then wire two in series.

[@khonlieu6619]

Great comment, I was thinking the same. The batteries don’t know and are operating as usual

[@hyperrunner4589]

Closed one is lot better than open one. And can you charge the batteries in series without any problems on high volts upto 126v.

[@nandrth]

Really cool idea 💡

[@Kfrankie46]

Wish these were able to be shipped to Alaska at a reasonable rate so I could get my hands on them, would be cool to build a pack to extend the capacity of my Bluetti EB240

[@TheMatixen]

great video! thanks for the info.

[@phillipanaya9233]

I would like to use all four in the case that they are in just tie them together somehow but I don't know how to wire them up together so I can connect them to the controller.it would be so much easier to use them as is . thank you so much.

[@fullyelectric]

Build it enclosed.. the case acts like a big heat exchanger

[@yellowwolf9389]

Would you have to charge each individually or would you need a 72v charger

[@a3i3t]

Go open batteries to see what's going on maybe add slow mo camera action too with thermal cam in addition

[@fred6121]

Hey jehu. I really enjoy your channel. I was just thinking about the snow snow we just got in new England and how my snowblower didn't start. Do you have any interest in upfitting something with a small engine? I think that would be a great idea and make a kit out of it. Helps us, helps you. Win win. Just a thought. Great contentl

[@MotoAlias]

I bought 2 of these... and then realized that I need the activating dongle... but I'm using mine in series for a 72volt battery... so do I need 2 separate activating dongles?? The 2 in 1 dongle would make my batteries parallel yes???

[@kevinduprey9326]

If your bike currently has (2) 48v batteries could you wire them in series for 96v ? Would you need anything besides new controller and capable motor to handle it? Thanks..

[@NotaRobot_gif]

How do you charge these batteries? And now long did it last in your test?

[@Juvelyn-kr9np]

mr jehu im a big fan of yours. can i ask where can i get that 36v batteries I'm from Philippines

[@MotoAlias]

So I got a couple of your activating dongles... they seem to be working but the lights on them stopped working after a couple minutes and one of them seems to be getting very hot... I think something's faulty in the dongle maybe??? I've got it worked the same way you do same batteries

[@justinhan6343]

So do I need a dongle for each pack or can you wire multiple packs onto one dongle?

[@phillipanaya9233]

Can I take the batterys apart and charge them in a smart charger like a loketta 4 slot charger

[@kobesparachute]

I want to power a battery backup. It's an APC 1500. I was thinking that the cheap option was a couple UB12180s cause it's a 24v system. Would the 10 banks of your 7s modules stomp a couple 18 ah SLA batteries in the dirt? Also would i need a BMS for that or can I just run my batt go on it to maintain balance. I shouldn't pull more than the capabilities of the cells in this application if I have 10 banks lol. I think I will pull 65 amps at the most

[@TheUnluckyGambler2024]

I have an E-Bike battery I want to use on a new controller. How did you use the Arduino to keep the battery on? Mine turns off with the new controller whenever a load is added. It has 2 wires that go to the old controller.

[@numberofthewarlock]

Are the packs priced correct? You said about $48 in the video but they're $57 when I go to your site?! I'd love to grab a couple. Do you also sale a pack charger?

[@mini4x494]

THANK YOU FOR THIS VIDEO :D

[@josealeixo2854]

Best video!! connect more please!

[@codynik123]

how does this work for an e-sccoter like JC motiv frame on a 60V 3500W motor? is it based on the specs of the controller or is is based on the capacity of the motor or both?

[@frankroach9346]

What type of connector are on the battery I’m looking for 72volt battery for back up to power up a 5000 watt motor

[@davestech6357]

The mosfets only see their own batteries being the maximum of your charge voltage. What you need is a diode across each pack to protect it from reverse voltage when one pack shuts down. Anode to negative and cathode to positive on each pack that you have in series under load. Time and time again that is the cause of the bms that get smoked when you have them in series.

[@londonboy1954]

I got e scooter thas got 52 volt can I just take it out and replace with 72 volt if same connecter and size so fit in scooter

[@robertmotion]

Great video. Question, my battery is 48v 20ah. My controller is 48v 20ah. Manufacturer upgrade from 20ah b/c none in stock. Will this combo work? Heard it could damage battery. I use PAS too when riding. Hope you can help. /Bklyn👑

[@perrymickle424]

I have 4 48 volt battery packs in parallel, but ive always wondered if i could put get over 100 volts from them, but i didnt think the bms on the packs would allow it, or it could have even be dangerous to try. thx for this vid.

[@seetheanimal5867]

The fact you thought that means you have no real conceptualization of batteries and thus should NOT be using them. For FUKKKKS SAKE

[@danielmartinelli701]

Great stuff! Here are my 5 cent: Think of a module as one single battery. Each module in series acts like one single 36volt battery each. including the bms. so no problem for series connection, each module just sees its 36 volts. except that in series the modules will not balance between each other. like any two batteries in series won't balance

[@jehugarcia]

They won’t drift apart either if they are Well matched

[@chris993361]

I am glad this was said. I came here for the same reason. The mosfets in each one don't need to handle more voltage than what the individual pack produces.

[@mikekendall5835]

I have a 36 volt golf cart... Can these be used?... If I wanted to get a 100AH battery pack how many would I need?...thanks

[@markdade1250]

What do you suggest I use to power my CSC 29-in 1500 w rear wheel evike motor for my specialized that I'm converting over that has a 48 volt controller? The battery that I'm looking at buying is 350 bucks and that's a 1500 w 20 amp hour 48 volt. I need your input on this one because I'm kind of learning as I'm going and I haven't heard of this scooter battery combination and it's got my interest cuz I like the sound of the price so what do you suggest I don't really want to go any higher than 48 volt 20 amp power That's more than enough and plenty for what I need it for just putting that out there

[@thecrazykartbyAJ]

What kind of connector and what for what is it used, the one at 10:26, at the end of the video? Thank you!

[@lourencesangalang496]

do you know what bms can used to molicel battery?

[@milanessencecelestain9875]

i am totally new to voltages and amps.I have a 96v lithium Lpo battery is 39 volts now. i try to charge but it wouldn`t take the charge. so how can i jump start the 96v battery. is it possible to use a 72v lithium to jumpstart with a lithium charger?

[@terryterry1655]

Can have more details of arduino setup? Thx

[@bankrollace8737]

This applies to any battery voltage?

[@upkarnewar2537]

So if my system needs 72v, can I use 12v x6 series to make 72v or big 72v battery (boyh will be lifepo4)

[@atrujillo7836]

I bought 4 of these for my brushless mx500 to bad the arduinos are sold out, guess I have to rebuild them into a single 72v 24ah pack

[@alireza071]

hello friend can i use this 2 cells in parallel for my 20s battry pack Samsung 21700 40t Samsung 21700 30t 6x40t and 2x30t is it safe and not cause any issues in future? thank u

[@rolfmurga173]

I need help with this set up on my kart project I have no experience with wiring

[@SunBitSynergy]

i plan to build a live axle drift trike using these battery setups

[@Bruh_im0]

Whats gonna hapen if i conect 2 battary with hout bms ?

[@dwey2557]

Hello how many pieces I need to make a 72 volt 40 amp battery pack?

[@anio6865]

I am looking for a 48v 23ah lithium ion battery ? With BMS ? I cannot find one at your store ? Do you make them ?

[@innersanctumoccultube278]

I need a couple of those. How do I get them?

[@MotoAlias]

Hey bud you still have these??? I'm starting a new project... Trying to decide on the battery.. My bikes originally had a 36volt then I did just this and doubled it to switch to a 72volt setup... Eventually the MS couldn't keep up with the power I wanted and I bypassed it for discharge only... But ya I'm interested in these batteries I think.

[@phillipanaya9233]

I just ordered 2 this morning

[@spYDerRyder82]

What the website please

[@AshKhoo]

I would like to know if the batteries are running in series, would the current increase as well?

[@jehugarcia]

No, only voltage

[@cardinaljoseph1947]

I have look at everything that you are doing, and it is wonderful seeing someone as talented as you, with such great talent. I do love seeing the things you do. But I do have a question for you. My scooter battery 36v 7.5Ah, it has 3 connector and each one has 2 wires. And anytime I try to charge it, the lid on the charger stays green. Could you help me figure out that problem, I will be very pappy. Thank you for listening. cJoseph.

[@seetheanimal5867]

The dude does not really understand what is going on or rather why. If you think he is “talented” please stay FAR away from batteries

[@jonathansperb]

You can probably connect as many as you want in series as long the bms doesn't trip. In that case the mosfets will be subjected to the whole series voltage. Another thing is that the bms has 6 mosfets in the discharge path but they as connected as 2 groups of 3 parallel and the two groups are series connected. They do that in order to have double protection on the discharge path. Same applies to the charge path. The charge mosfets are series connected. Anyway, you could have turned off one of the arduinos while the inverter was draining power to be sure that the bms can actually protect the battery while in the series connection. Another thing to think about would be how to properly charge the series connection. I think the best way would be having independent chargers, one for each of the series pack. And always use the charge port, as the discharge port is not able to disconnect the charger as a protective action.

[@MonbogDecan]

Hi, what do you mean, " connect as many as possible as long as bms does not trip?" I'm planning on using for EV, as 10s or 9s ! (As an extender battery). That would be over 400v, would bms trip, how to avoid it tripping. ?

[@Full_Throttle_no_Brakes]

@@MonbogDecan It trips when the discharge current is too high and/or the voltage sag is too much

[@seetheanimal5867]

@@MonbogDecan bro are u like sure that is the project for u 😂

[@phillipanaya9233]

How long is it taking to get a order

[@christopherbrand5360]

Pretty sure that those mosfets only see the 36 (42) V of the individual packs no matter how many you connect in series. The mosfets are all in series with the pack they serve and there is only 36 V between the terminals of each pack. What am I missing here?

[@Mainstream818]

You are correct the mosfets will only see the voltage across there respective battery pack. They will see no more than 42V

[@marchoekstra1076]

That's what I thought as well. You can ramp it up to a 1000 volts connecting them in series and the individual packs (and mosfets) still will be happy as a feather

[@christopherbrand5360]

@@marchoekstra1076 How happy are feathers? I thought they were known for their lightness ;)

[@melovescotch]

Say it's under load with 10 packs in series, but then one of the packs mosfet turns off. That set of mosfet will see entire pack voltage and blow.

[@christopherbrand5360]

@@melovescotch how does closing the mosfet increase the voltage across it from 36 V to something more than that? There is never more than ~42 V between the leads of each pack or across any component within one pack. If you put a mosfet between the most positive terminal and most negative terminal of the series, then you might have a problem, depending on the rating. But the circuit within the pack is still 36 V (nominal).

[@danielhusar9991]

Where is the link for the 48.00 packs? It says 54.00 at that link

[@511chaddy]

I’ve run those batteries like that before going to a 72v 1000watt controller to a 42v hub motor and it runs fast and dosnt burn out the motor like I would expect.

[@mhg08051]

How did you connect the two batteries? negative from one to positive to the other and then through Activating Dongle?

[@yupsir791]

This worked great for me(40 miles) till I blew the 48v motor controller. I figured this might happen... But it was doing so great, reaching 32 mph. Looking at upgrading contoller now. Hopefully 40 mph!

[@seetheanimal5867]

U ran a 38v controller at 72v. Did you at least check on the capacitors first ??

[@yupsir791]

@@seetheanimal5867 48v controller on 72v. Yes I checked and they had 63v stamped on them. Need to get back on the project. The new control or screen doesn't like me hooking up the batteries. Ill get spark and then doesn't turn on. If I do it really slowly I have better success.

[@joseroblesreyna4172]

Can you share the link to the special you mentioned

[@jehugarcia]

In the description, code BYE2020

[@dwey2557]

Hello I'm looking for a 72 volt 40 amp 2000W Lithium Battery pack for my electric E-bike I was just wondering if you sell anything like that?

[@lewicheung]

Nice. Want to try this! Is there a pad on the FETs to transfer heat to the aluminum casing to dissipate heat?

[@jehugarcia]

no These are completely surrounded by a rubberized compound inside the case

[@jasonpenzo8624]

The FET's shouldn't care about the total voltage. Just the amount that it will add to the potential. I may be wrong but I don't think the FET's will have any issue with adding many more to the series. When voltage increases to the point of insulation issues then it will become a problem. Normally around 600v.

[@MonbogDecan]

@@jehugarcia btw, this rubberized compound is excellent at transferring heat to the aluminum casing. So the whole case is the heatsink...

[@sysghost]

That Arduino thing to keep the batteries alive. How to set that up? Been looking for that for years now and no one has been able to come up with anything remotely useful so far.

[@jaylord55]

thats still only 42v from the bms all your doing is seriesing the bms's witch is after the bms

yes...

[@tedhancock68]

Yes. However the doubled voltage will increase overall power to the load (which is the point). That will push the mosfets' amperage handling, but they won't see any additional voltage. Jehu will put these in his van, without the huge aluminum heat sink, and when they blow, he'll decide that they can't handle that voltage.

[@xmtxx]

Thanks, I was wondering if I was stupid, or missing something really obvious. Those mosfet will only see the voltage of their own battery, so 42V at most. You can stack them up all you want and have a 400V battery for an EV. I don't understand exactly the point of this video. Does Jehu really think those mosfet will have to handle the whole voltage of the circuit? Or, am I missing something?

[@tedhancock68]

@@xmtxx I'd say the point is to show that these 36v packs from a mid-level scooter can be combined to 72v which is used by those dual motor (2400 watt) 50 mph scooters. It's not a no brainer since such a scooter (or bike) will put incredible stress on these packs. Jehu seems overly busy and distracted lately. I think he's also trying to figure out how to keep us consistently entertained. If you got him to sit down for a second, he would get the voltage concept. In fact, elsewhere in these comments he admits to the error.

[@xmtxx]

@@tedhancock68 I get that he tried to respond to the question his audience/customers asks him. The fact that his theory is wrong, is probably because has been distracted, as you said. He saw another comment where they explain that the mosfet only see 36V nominal. He is aware now :).

[@The-Bergens]

Do you think this would work in a VW bug I’m converting to EV

[@JanEringa8k]

I could be wrong; But I believe that the voltage rating for the mosfet is the max voltage across "that" mosfet. So if you string them in series; As long as the voltage across a single mosfet doesn't exceed 100v your are golden. The bigger issue would be heat... Don't mosfets and transistors suffer from heat based run-away?

[@seetheanimal5867]

U like do not understand a god damn thing going on here do u 😂

[@oa1583]

How do u charge it with the bms at series can u get a 72v charger or a 36v

[@jehugarcia]

72V charger

[@David_Lee_33]

I have a question.... I know nothing about what I’m trying to make so any help would be nice... I have 100 18650 and I have a 3000 watt sine inv. With a solar kit from harbor freight how do I configure the battery wall (wire the wall?) and do I need a BMS ...Please Advise thanks.

[@mikemesec]

You always want a BMS but first youll have to figure out how many volts you need for your inverter so you know what size BMS to use. For instance if its 48 volts you could set it up as 12S or a 13S. Say 12S8P would give you about 50 volts charged and use 96 or your cells. Youd then use a 12S BMS with it.

[@AmateurInventor]

Hey, can you export these to Nepal??

[@edoardoagostini1800]

I made a 72v ebike, using a 72v 2000w controller, before I had lead acid batteries and it was working pretty fine, than i wanted to switch to lithium battery, so I bought 2x 36v batteries and placed them in series, but they keep turning off when the hub motor start to push... i believe is a kind of protection for the cells, but i would like to remove it... can I? thank you for the video, I will look more into this mosfet stuff...

[@ianmangham4570]

Your controller or lcd isn't recognising the voltage

[@peterkacandes5905]

I’m doing an EV conversion of a BMW K1200s motorcycle, and I’ve been thinking of using these for that. 72v would be fine fir my forklift motor, though it could go up to 100. How would you charge them once you’ve put a bunch of them in a combination like 2S5P or 6P or more?

[@jehugarcia]

A 72v charger

[@fullyelectric]

Very cool .. I need to upgrade my old DIY power wall and very interested in using this setup .. please build a power wall with them Looking to equal or better 25kWh ... include everything needed .. best charger to use / setup well etc...

[@christopherking2999]

I want to add a battery to an ebike just to increase range. Will these batteries do that. As you can tell I know nothing more than what I see on your videos. Thank you by the way.

[@flitsies]

Won't you need to series parallel them in order to get the power you need to run a car or motorcycle? Yes series them to get the voltage but parallel them to get the amps up so you don't burn out the fets.

[@jehugarcia]

Yes

[@drzprince176]

what if you have 4 and connect 2 pairs of series connections then connect those 2 pairs in parallel?

[@seetheanimal5867]

You get the volts the amps EVERYTHING

[@leoncostley4370]

I would be interested in two 36 volt batteries. As my 72 volt 8000 watt Hub motor I'm putting on my medium size street legal motorcycle. I stopped project when I learned that I thought i need six 12 volt lithium batteries that cost close to $2,000.. I definitely need help to complete my project..

[@MaxGoddur]

I have a 54.6V pack that went dead it drives a motor load requiring a max of 15 amps. Do you have a pack I can use for this setup? The dead pack was 13s4p configuration 18650 cells. Need to have a port for charging and BMS built into the case. If so how much?

[@jehugarcia]

surplusbatteries.com/collections/frontpage/products/lithium-ion-rechargeable-samsung-18650-inr18650-33g-3150mah-6-5a-pack-of-39-batteries

[@MaxGoddur]

@@jehugarcia Can not tell by looking at the pictures so will ask could I take that pack and charge it (does it have a charge port and BMS) and it will meet the required voltage and amperage called out. Ready to order if that is the case.

[@ninjaswag4846]

Id like to see it open if you do it

[@reviewit8680]

Do it with the open ones please. We need to see where they are weakest. I own 10 of these puppies and want to see if they smoke after large draw of voltage. I'm building a power wall with them and the more info I have the safer it will be.

[@jehugarcia]

they shut off at 25A I tested this on one of these videos

[@jankesalez]

@@jehugarcia Cool they are safe then. I built a small power wall with them.

[@seetheanimal5867]

That means tooo dumb to fukk with batteries like this

[@benjebikescalia3674]

But how many amp hours would you get for those packs all together like that 72v you made?

[@seetheanimal5867]

If u can not EASILY figure that out. Don’t FUKKK wid batteries

[@markdade1250]

Awesome

[@kevinroberts781]

What happens if one of the bms shuts down? I would buy some but I'd have to rip that BMS out. To much work for the price.

[@jehugarcia]

Same thing that would happen if any other bms system would shut down....

[@MuratKoldamca]

If charge them 84 volt charger what happend to bms

[@noah786]

Blow it up!

[@scottwood1421]

I want an 8x for motorcycle package!!

[@sctpc]

Says $56 on you web site. Nice stuff there mate

[@jehugarcia]

There’s a discount code on the front page of my website

[@derrickkorraa5996]

What kind of charger would you use for something like this?

[@seetheanimal5867]

Wow like really ur asking that 😂

[@anio6865]

If I use 2 batteries in parallel, both 48v 15ah ? Will it then be 48v 30ah ?

[@jehugarcia]

Yes

[@dalehall3110]

Don't kill them!! I run 72 volts, 50 amp bms on a Bafang BBSHD with an ASI BAC 855, draws 45 amps peak with 40% field weakening. I wouldn't mind havin 4 of these to run 2x2 for 72 volts at whatever they come out to in ah, hopefully over 20ah.

[@riccardoperuzzi99]

I don't think that the mosfet are a problem. The batteries are indipendent and connected in series. Every set of mosfets (which are 6 in parallel) will have only to switch on/off 1 battery, so they will always work with 36v

[@jehugarcia]

Circuit voltage will be higher than 36v if you use 2 in series

[@mactrucin]

i was so puzzled when he started talking about Vds breakdown voltage seeing full series voltage per FET. they only see their own output.

[@riccardoperuzzi99]

@@mactrucin yes, I think so too. Every mosfet sees only the voltage of 1 battery pack, don't they?

[@MonbogDecan]

Yes, I'm confused too. How can we accurately measure the voltage each mosfet is receiving. I want to connect 9 or 10 in series

[@jons6125]

Is the voltage across each mosfet not the same as if they where not in series?