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DIY: Home made Ebike 48V battery from laptop 18650 cells without BMS
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- čas přidán 12. 02. 2019
- Make a 48V electric bike battery from (low discharge) laptop 18650 cells. This battery has no B(M)S! It is charged by 2 external balance chargers. Other links: 100V voltage meter: • Review: 0-100V Battery... ; How to balance charge Li-ion: • How to balance charge ...
Learned more in the first 3 mins than most other CZcams videos about batteries, thank you
Your are so kind to give us all those instructions for free . I love your accent btw. You make it simple for us to understand, probably saving lives .
Good job 👍
Glad to see you are not using a hateful BMS! Seen so many packs ruined from BMS killing banks of cells. Exactly the same as I have done except I have made 2 6p5s packs that I charge using my rc chargers then use a Y lead to link them together for a 6p10s. I will never use a BMS again. As a note, set your charger to use a cell voltage of 4.05 or 4.1v instead of the 4.2v, the pack will last literally twice as long (lifetine) due to charging to about 85/90% of capacity instead of 100% all the time and stressing the cells.
I wanted making better not bms ?
I'm not sure the BMS is as important as a timer or energy level....
Those BMS have caused a lot of problems.
@@Mr.EeToMyself Indeed. All I use is an independent voltage monitor/capacity meter when actually using the pack, and this gives me a very good indication of the current state of charge. If anything has gone wrong with a cell, the charger bms will tell you at the point of next charge, which has never happened yet in the last 5 years and now over 550 charge cycles!!! - and the pack is still going strong with 93% capacity!. Just goes to show charging to 90% and discharging to no lower than 20% really does extend pack life enormously...
Thank you, nice, fast and needed info conveyed in an understandable way.
Thanks so much this is an excellent video. My e-bike battery has stopped charging so I am going to build my own!
The new Milwaukee m18 12ah battery pack has 15 cells Samsung 3 together in series is 60v 12ah 21700 40t if you find one on Craigslist offer up or Ebay there 100$ to 115$ it’s still cheaper overall than buying Samsung 40t cells from a battery store and as a bonus now you can use Milwaukee heavy duty line of tools like the chainsaw hedge trimmer blower miter saw etc make sure to buy a Luna Cycle 52v charger 110$ with shipping finally endlesssphere showed me where to look inside the controller & I turned up the pot dial & the cut off voltage went up to 60v up from 58.5 perfectly happy with my setup videos like yours inspired me
Thank you! I love your videos !
Nice , helpful . Thank you so much 👍
gracias amigo por tus videos
Great work!
Have come across a lot of your videos on my ebike journey. V helpful and welll explained. Thank you!
I love watching your vids
Your the man
You are amazing.GOD BLESS YOU.
nice build!
Theory & Practice in Harmony!
To most demonstrators, showing your corroded battery pack is like showing next weeks washing.
Tie those cables up away from the tyre and brakes, and try extending your rear mudguard to stop water spraying up from the tyre
I'd always use the same cells myself but realise this isn't always an option for some. Good job though man you got it working🙂
Get some heat wrap around those batteries, try to seal them up to stop water getting in or you'll end up with heavily corroded batteries again bro. A little extra expensive which will save you a lot of money not having to find new cells and rebuild.
I'll be making a 60Ah battery after xmas out of LiFiPo4 cells, 15cells 3.2v each @60Ah =48volts @60ah. The cells are expensive but the capacity is huge and the chemicals used in the cells is the safest on the market. They're said to last thousands of charge cycles, very reliable cells.
Hospital use these cells in their medical equipment as a power back up, electric never goes off in hospitals so the batteries don't get used but they are replaced every 5 years regardless. Find our when the batteries are being replaced and you could potentially buy the ones they are getting rid of for very cheap my brother 🙂✌
How did it go?
@@AQHChannel he dead ? I heard they are dangerous 😂
I'm pretty sure it's ok to mix different capacity cells you just have to make sure each parallel bank has around the same capacity, I'm also pretty sure you can mix different discharge amp cells together as long as your not drawing too much current
You can. But you have to be careful in your calculations or all hell will break loose. This is a good topic for debate and maybe I should make a video and talk about this.
@@vuaeco you only have to calculate if you are mixing different amp out put cells not capacity really, each bank just has to have the same total capacity, but hell yeah make a video on it dude I like your vids
Hi! Great stuff here. I recently bought a ebike and the battery and charger both are Kaput! I feel terrible just recycling them. Could you provide any advice on what i can do to salvage or possibly even get a 2 for 1 on the batteries. So like now have 2 batteries to travel with. Thank you in advance.
What i can do with my old battery one need change cover and 6 batterys but still works fine other I have just battery without cables and case
Great video
I savage bunch of 18650cells from laptop battery.
I was still having issues with measuring the capacity and internal resistance of those cells. I use to make a random selection to choose for my ebike, unfortunately it doesn't last long.
Please, kindly recommend an 18650 internal resistance Tester and a balance, considering low budget 😂.
Thanks
@10:27 you can use 2"x4" wood, to hold everything from under the battery instead of holding them from the top.
Thanks Earnie. That's a great idea!
How do you test for discharge rate of a cell ? How do identify a bad cell after it has been soldered together with other cells?
3:58 How do you test them for capacity?
5:32 How do you test them for discharge rate?
I'm not sure from which country you hale from, but I'm guessing electrical ebike fires are common correct? Just the possibility of a litho fire warrents a BMS! Home, vehicles and loved one are worth it!
Thank you alot. Finally I found the answer if 12s battery work. !!
why 12s ? answer because is 2 battery of 6s that can be balance charged by 2 rc. chargers.
Hola solo tengo una duda mí bicicleta es casi igual a la tuya pero no sé el voltaje máximo del controlador las baterías también las armó en casa . Original es de 36v el controlador tiene capacitores de ,,80v le podré poner 48v ?
hella big battery, nice
I agree with Shaik , in wish I could send him some batteries from some of my old drills to re_do so they would work & charge like they should ! :-) awesome job !!!!!
Can i recharge a diy battery like this using a power inverter
you got a video how to take off a bms from a good 52v 20ah battery ? how do i do that ? and can i still charge it on charge port from battery pack ?
You have the battery packs connected. How does the charger charge only the 1 pack and not both of them. Most people use a fuse to separate the two battery packs when charging
2 liter bottles with the tops cut off and shrunk to the pack will keep your pack dry,just flatten out the ends.
Great idea! How do you shrink it? Heat gun?
@@vuaecoThanks for your video ,I am building a battery this weekend from dead laptop batteries I will use those bottles cut off the ends and hit it with a heatgun.Bingo easy cheap shrink wrap. Your building yours from reclaimed cells I need to keep an eye on the Amp discharge rate too thanks again for the Ideas,I want a 48v 1000w battery but I was going to build a 54v overvolt to try to get more power since I am a big guy riding a 29" wheel for tork maybe still working out the math for the config in a triangle.
hy , if i have cell's from 1700 to 2300 mah can I use them all in one power pack ,( 120 cell's )? or I should use only 2000-2300 cell's in one small pack ( 50 cell' ) thanks
In general, laptop battery does not have high C, they have high internal resistence. Using such battery in high current application might generate excess heat and result in fire
I am planning to make a bettery pack, 5ah 10s. But I have 20 batteries with a rated capacity of 2000Mah, and 30 batteries with rated 2400Mah, is it possible to put then together in a battery pack? Would the difference in capacity cause issues? Please !
Can i add 2000mah+2200+2500+2650+2750+2900 for a set of one parallel, will it work if i construct all 13 parallels in same way, im asking because i have different ah batteries but all are branded and salvaged from old laptop batteries
a friend gave me as a gift a 36v kit ... told me had problems , he told me the motor didnt run and he assumed the batt didnt charge,,,, the batt pack havent been charged like 3 years , you think if i can revive the cells in case all are in good shape and remove the BMS the kit can work? i think is a 2012 kit so i think is just a balance charge bms
How'd this battery do over time? Still working?
Yo 1 question!
Can you charge 2 packs of 7s batteries with 1 7s charger?
I would like to make a 14s 4-5p battery without BMS but do not know if i should get 2 7s charger (1 is 100€) or 1 is enough with higher charge time?
So Mr Vu, Are you going to show your ebike with a zwift (most recent commercial). Dont need to answere that one, but I did watch the full commercial.
DO you have a link to second pack plz
please tel me abute your bike controler. what is the volt?
NICE
Awesome
You could waterproof the battery box with shrink wrap
Shrink wrap gets brittle with exposure to UV (sunlight), and would also have to be replaced every time you open the box. Silicone is a better choice, IMO.
You could put an adjustable potentiometer in lin and run the 15. Then you can limit the voltage.
That smart charger looks neat where is that from ?im using my 48v charger standard an have a drok charger universal one from power supply.i just changed my front hub motor to 500watts from a 1000watt an up hills it loses power just for couple secs then back on every now an again it is a steep hill goin back home.why is that.?dont use bms.last one didn’t last long an that was 30£
I personally use R/C I max charger ( i have multiple use for it)..for some reason the fake Imax allows me to charge cells under 2.2 (which is fine..I need it to
recharge cells that might drop under 2.2 when salavging batteries.
My R/C only allows me to recharge at 6s..it's 25.2 V fully charged.
I can put 2-ea 6s to 12 50V...it's in the 48-50V range.
I prefer to manage my batteries that way...any ways...so i can repair
packs and trouble shoot easier...use it in different things...such as Powerwheels at 6S
It depends on how many parallel you use and what C ratings
Laptops are only 10-15C..I'll do 4 -ea to 8800mah per 1s
basically 24-ea 18650 per 6s at 8800mah at 15C..
It might be from your ESC with auto thermal shut off...trying to save itself..
it's like that on my r/c ESC...
or it could be from your Batteries Thermasta...that black tear drop
looking thing...
The 1000W Brushless...is SUCKING/PULLING alot of electrons.
It'll generate lots of heat in the batteries....
It can also be from your motor getting TOO HOT trying to save itself too.lol
or Solder joints coming loose in packs you made.or one of the 18650....diaphram
is getting ready to dis engaue...if it gets too hot..
or solder joints from connectors ect ...48V is alot of electricity.
it'll heat up solder joints..Sometime the heat shrink is the only
thing holding the joint in place..then sort of resolder itself.lol
Trouble shoot and Isolate.....check the connectors solder joints
That's why I prefer to limit it to only 6s build...so I can trouble shoot
for a 18650 going bad...
I had trouble with connector solder joints from
time to time.
I use thicker wires..but really need to change my 48V connections
to something more beefy..Rather than just re inforcing it with HOT GLUE to
help the heat shrink..lol ( clamp and solder the joints....)
Becuase the Connectors are sort of bottle necking everything...if they're
not rated at 48V or better...Solder not being able to handle the heat...
Yeap....different solder grades...too.
Most electronics are 5v-12v Max.lol
Good day, I have a 48v 1000w ebike kit. I just want to know if can build two of the 7s and series it together to make 14s. Want to copy your version on how to build battery pack. The problem is if it is compatible with my 48v 1000w evoke kit. Thank you so much
Yes you can and it would be fine
I have a 48v 1600w uberscooter. It currently has a SLA battery. I would like to switch it to either a li-on or a lipo. I am not necessarily interested in increasing the speed bit increasing the distance I can travel (at a decent speed) what would you recommend? And how do I build it. I'm just learning... love you videos!
Hi there Vuaeco. Please what's the AWG (gauge) of the final cables from the battery pack? 10? 8? Thanks
14 should be fine. I use 16. must be quality silicon cables as you know
Is it dangerous to not use bms? I can't really afford the high tech components so want to build one myself
Safety first !! No wonders why did corrosion 😳
Can I sell them both?
Ok, sorry I have one more query here 😒😒 kindly reply if you don't mind
I have 18650 cells from old laptop battery.
I have cross checked each and every cell using digital multi meter
1. How it's is possible after couple of years also that cell showing voltage few cells 3.00v others 3.90v means most of cells are above 3.00v InFact over the cell desciption writen it's capacity is 3.7volts.
My query is if the cell is showing more that 3.0v does it good or bad/dead cell, Can I use it for e-bike since each cell have different volts
2.In the vedio as you said cell have 3amps, now I would to check amps can you please tell if cell have less than 3amps can I use it for e-bike projects.?
3.What is the cell min AMPs should have been used for e-bike.
4.on description it is written 3.7v but when I'm checking it shows 3.90 it is good cell or dead can you please me here. Kindly reply.
You need to run a charge/discharge cycle test to determine its mAh capacity. That's how you can determine a good or bad cell. Watch this video if you want to learn more about this process: czcams.com/video/yuLdi4oT7xI/video.html
👌👌👌
What internal resistance do you have on each line ?
I stoped using laptop cells years ago because of high resistance over 50 ohms and now I'm using cells from cordless power tools and Hoovers wich have resistance of 2-3 ohms
Ohms or milliohms?
@@Ijusthopeitsquick miliohms sorry
the real trouble is that if some cells goes bad then your voltage will drop and you will empty some cells too much compzre to the others which can be very dangerous.
If you rely only on the general voltage you can't tell if one or many cells are out of service. If only one cell goes bad then all the load goes to the other parallel plugged cells... Do you understand how dangerous it is ?
A BMS is dangerous too. He is still using a balance charger so would be alerted if some cells have problems when charging
Soda PET bottles work really good as heatshrink.
charging with rc charges is a hassle, ask me how I know ive shorted out balance leads charging lipos in parallel.
Hey man.Im sik.I got an electric motor for my bike so I can keep riding.I can't afford a battery. Will you send me one? It's 48 v
trebuie fiecare grup de celula in parte izolat ,separat una de alta, ca sa nu se atinga marginile intre ele, in caz de se duce izolarea intre doua celule se face scurt pe o celula ,de poate sa ia foc tot acumulatoru...bafta.
Can u parallel charge ebike batteries with bms with the same charger?. Eg, parallel charging 2 60v 20ah batteries with a 10amp charger
You could, but why bother? Each pack would only see 5A current, takign twice as long. IOW, no faster than charging one, then the other. The only advantage would be not having to switch the charge cable from one to the other, but my rule of thumb for li-ion is to only charge while I'm awake. Laziness = homelessness!
@@fun_ghoul I bought an outlet timer. I sleep easy
@@svendolufsen849 If it's not an Intermatic in the metal box, your easy sleep is in vain.
Don't understand why you added there one pack with 13p6s Bcz the first pack 13p7s itself with give the 48v right???
13P7S is only 26V. To make a 48V pack, you need a 12S to 15S battery pack. I think you're confused with the P and the S. It doesn't matter how many P you get in your pack. P is just for increasing range. S is specific to voltage of a battery pack. By the way, my battery is not composed of a 13P6S and 13P7S. It is composed of a 7P6S and 7P7S to make a 7P13S pack. Big difference.
@@vuaeco thank you boss really confused 😇😇😇. I have collected scrap laptop battery but now don't know how to make a battery pack, issue is sorting, align how to align/order which cell should be positive and negative.
2. What is the minimum voltage and AMPs each cell required for e-bike for 48v40ah or 52v40ah
Can you please share if there is any blueprints or drawing sheets for cell align.
kmurali.krishna00@gmail.com
Requesting.... Here
Please reply here.
Alright,
750/48=16AH is required us that you are saying ??ok
But 48v16ah battery pack how long it will work/how many kilometers we can ride?
1. What if we supply more than 16AH.
2. If more AH required for long ride/more km I would like to add more cells to reach till 30AH or 40AH is it possible, Can we use such AH for 750w motor?
3. Note recollection from scrap/laptop battery so cells many not good at AH so just for getting more AH I would to add can I use on that way?
4. What is minimum AH(2 or 2.5ah)for each cell to use e-bike.
I don't think 6 cell laptop battery each cell have 3ah for reuse.
Please reply
You're mixing up Ah with A. They are not the same at all. 750W/48V = 16A (not 16Ah). That's the maximum the motor requires at 750W. When going up hill, a 750W motor can use more than 750W (maybe 1000W to 1500W in short burst). So yes, you can supply more than 16A. The more you can supply the better. 2. You can supply as many Ah as you can by adding more cells in parallel. But you only have limited space in your bike. 3 and 4. Each laptop cell can only give you 2A to 3A discharge. (not Ah) You will need at least 16A to run the 750W, 48V motor so you will need at least 6 cells in parallel.
@@vuaeco how to check call discharge rate can you please reply here.
Can i use battery with different ah?
You should use batteries with the same ratings (Ah and discharge rate). But I'd say you can get away with about 10% difference.
The downside is if you have one weak cell group (lower capacity), it will drop in voltage faster than the others, so say discharging to 40V should mean 3.07V per cell, any weak cells would go below that. At least you tested all the cells first, so it's not going to be too serious.
Can be installed rc cell loggers and you ll now when and wich cell is discharged.
The one I made without BMS was overheating and the cells started exploding
Buy an umbrella to put over the battery.
Isnt 18650 do 150 to 30 amp and not 3? 😅
Your cells need to be able to breath! If you fill in all the gaps with hot glue the cells can OVER HEAT!
I would NOT recommend doing this! As these cell can literally combust and Explode if gotten to hot! That’s why when companies build Ebike battery packs they use spacers to let the battery’s Air cool down naturally! This way with all that glue there’s no holes it’s just a solid brick of batteries! Just a small pea size of glue is enough! This amount in the video is SO over the top! as the tin strips used to weld the cells together will hold the battery pack together.
yes I can see that. @vuaeco burning 30amp on the cycle track for 10 min with a trail of flames and black smoke, way to go
i couldn't help but notice it sure looked like the original battery for the bike in your demonstration of he video was still on your ebike and i couldn't see any of the wiring from the laptop battery actually plugged in I'm not saying you didn't do what you claimed i do actually really like your videos but maybe next time show how its actually attached to your controller?
Great video but how are you building a battery pack and using one of the cheapest voltmeters on the market? 😂
It isn't the cheapest, it was free from Harbor Freight.
I noticed you have several cables that are not terminated. These should be terminated, if for no other reason, than to keep out water and debris. I agree with @Andy B, add a mudguard. :)
Should have got a kweld spot welder.
A welder that requires li-po or lead-acid batteries defeats the entire purpose (or rather, re-purpose) of this video. It also requires assembly, and costs more not only compared to the Sunkko unit he has, but even than competitive battery-powered products like the Arduino Spot Welder. So, no.
@@fun_ghoul lol it's you again
@@thediydude4110 LOL, you're an idiot.
what kind of accent is this? its like honey for my ears lol
Sorry I find it a bit fake. I see a charger with bms. you balance charger. So you discharge without bms.
Kable wisza kolo opony. Ej. Nie rob kaszany...
no bms battery should be criminal especially when working with salvaged cells... wtf
If you put battery cells in parallel, you must have them behind diodes, otherwise they will charge each other.
buk lau
This is the link: czcams.com/video/ZLLQ9Br4GBI/video.html
Why does every 1 on you tube who makes a video always leave the most inportant bit out of video its like you all have something to hide and maybe lie about there is no 1 on this site that shows a video step by step all the way through with out missing stuff out some of us who watch these videos i looking how to make 1 or just looking for a certain bit of info we are not all as clever as your selfs. All i am looking for is how you wire it all together because me and electrics is not good so thanks for skipping that part just like every 1 else on here thanks.