Battery BMS Repair - How to and Not to
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- čas přidán 21. 01. 2022
- My small 48v battery voltage was reading 2 volt higher on the charger then when off. So I found this is a sign of a bad BMS. Think this was caused by connecting in parallel when the voltage was off by more then .1v rush current in and firing it. When really I now know to get it within .02v.
The easiest fix for this is to replace the BMS with a new one. However I forgot to check to balancing lead polarity and the unit I bought went pop. So I order an other one.
Please use caution when working on your own battery for you may injure yourself or burn down your house. It could even lead to your death. I show my mistakes so others can learn from them. Let make this clear I am in no way responsible for your mistakes.
{Battery BMS Repair - How to and Not to parts}
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092422/1639 PST 🇺🇸. Thank you for demo. What was interesting in the video was that, the length of the BMS cables were cut required length. That was the most interesting feature of the video.
Thank you again, for demonstrating the idea. There are several postings by CZcams Warriors that
“NO NO, THE BMS CABLES must not be cut to required length. The sky will fall down ! (I added this!)
The cable can be snipped to required length, readers please understand this.
Thank you, Sir, for the ocular proof. Best wishes. 73s…
Would need to be a truck sized battery before length would matter that much.
good job man, first thing first those amazon bms dont do balancing even they say it does :) second thing i think first bms you hooked up was wrong way round and blow the resistors thats why the bms heats up and last thing if you want a long life from your bms just bypass the discharge connection, that way you get more power from you battery and eliminate using discharge function of the bms (less stress for bms ) bms there for only to deliver 4.2v in to blocks equally, if you have bad cells in the pack replacing bms will only be a temporary solution after few cycle of usage the problem will occur again best solution replace the lowest cells when replacing the bms.
Trial an error. Yea first one balance wires were backwards. Didn't see that until after I cooked the board; because I didn't realize they had a 2 way standard.
If and when you do this again, try using a dremel tool with cut off wheel, to reduce risk of shorting out.
Buen trabajo! Estoy seguro que estos dispositivos, como la mayoría, salen la factoría con obsolescencia programada.
Solo tomaría un condensador para cronometrar su final.
@5:59 Excuse me, thats my title. If there was a bomb with an hour left on the timer, and I have soldering iron already plugged in, solder, flux, and only needed to solder 1 wire to the board, we’re all going to die.
Want to find out some good 13/14s BMSes. Ideas?
Am thinking that BMSes should be *entirely* connected by anti-spark connectors… seems Amass makes ~ 100 Amp bullet connectors.
Would make for faster swapping if they were sold with bullet connectors. If it the right BMS there will be no spark. I seen while editing this video that both BMS's have B+, B- on the board by the balance wires connection. Oops.
The main output wires, some use XT90 anti-spark connectors. At some point I may move to these for better efficiency. Right now I'm using Xt60 with sparks.
Hi sir I'm build one battery back 10s8p I already to connect everything but I confused bms wire which size are using so please help me
Not sure what you are asking.
Hi, where did you get the voltage checker?
🛒Meter: amzn.to/3nM6N28
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@@Eric_Tennant thank
Anytime
So, my 60 volt e-bike and its battery got stolen a couple weeks back, and the other day the police returned it and the battery. Now, rather than charging up to a maximum of 70.3 volts, the BMS is saying that the battery is only a 48 volt battery. Did the thieves give the police the wrong battery, or is the BMS acting up? Not only did the battery come back out of its wrapper, but when I completely unwrapped the battery I noticed that four cells were removed from one end of it. The thieves may have removed the four missing cells, or the battery may have simply came that way from the factory. Not sure
Sorry to hear that. Don't think it the bms. They did something to it.
Hey i just made a 48v battery for my scooter it runs but i cant charge it. When i test the individual balancing ports i read 3.4v for most but 2 of them are reading 10v and -17v cant figure out what i did wrong? Any help would be appreciated
That's odd. 10v - 17v on a cell I would think it would explode. 4.2v is the max a cell should be.
It means the balance leads are connected wrong. While it’s possible on a dumb BMS, it’s more likely on a smart BMS that works for 7s to 16s.
On the dumb BMS which only has the exact number of leads needed, its not easy mess that up, but for smart BMS they have different wiring diagram.
For example, my ANT 10s-24s you just connect in order and leave the last wires disconnected since they aren’t used, but my 7s-16s has connect 2 balance leads to one of the middle series and omit wires between those two. Very odd if you are expecting it to be ordinary.
So check the wiring diagram for your specific model and for 13s, it will tell you which wires to omit and which two wires to connect to which cell.
For example, on the ANY 7s-16s wired for 13s, you would omitted balance leads 8&9, and connect balance leads 7&10 to cell 7(+). All the other balance leads would be connected in sequence like any other BMS. And as always, BMS must be connected to battery (-) before you connect the balance leads to the BMS.
But I’m sure by now you already found the solution. Lol
Hi, I have a Kugoo G booster , my voltage is dropping from 51.4 to 0 in seconds . I leave it for few hours then it works like nothing is wrong !! it occurs randomly. Do you think my Bms is damaged ? and after seeing your video i have gone through some bms on amazon but most of them says ≤500w motor and i have two 800w motos so can i use those ? Any answers will be appreciated. Thanks.
100% the BMS is doing that. Ether its bad or it detects the battery is overheating. The only other reason BMS would shut off the discharge is if one of the 13 cells (Columns) drops below 3.6v; however it wouldn't come back until it was charged past that voltage again.
I am currently using Daly BMS in my packs for my 48v amzn.to/3mxLvYh
@Eric Tennant thank you.
@@Eric_Tennant but do you think changing the bms would solve the problem?
@@nafi.j Yea. a 30ah bms would work (54.6v x 30ah = 1638wh). So long as that scooter allows for any bms to be used. Daly takes its own plug so the balance wires would have to be replaced for that brand czcams.com/video/zhymnU83Jlo/video.html .
Also if battery is overheating this wont fix it.
@Eric Tennant thanks mate.. I have zero experience with this but I'll give it a go let's see what happens.
Thank you! Very helpful video! I got a 13s7p battery, and one of the cells is discharging much faster than the others. Also this cell charges only to 3.5-3.6v, when the others are 4.2v, and the charger light turns green. And when storing this cell once dropped to 1.5v. According to your experience, is it a bad cell or bms? Thank you!
Try to charge just that row and see if it will take a full charge. If not then it's the cells. Battery is only as strong as it's weakest cell.
Most bms do a poor job at balancing for what I've seen.
@@Eric_Tennant thank you! I disconnected the bad row, and one cell is losing voltage pretty quickly. From 3.2v to 2.2v in 5 hours. I guess it’s the reason… the other 6 cells keep the same voltage. But they were discharged all the way to 1.5V some time ago which I guess damaged them. Should I replace the whole row or only one cell?
Just the bad cell I would think. Does the 6 cells charge to 4.2v when the bad one is removed?
@@Eric_Tennant I ripped off the strip on the positive side, and now I need to solder it back to check? Can I connect only six of them to the strip and leave the bad one disconnected and plug in a charger? I don’t have any imax b6 to check the cells separately.
Not sure. Could work; however the other 12 rows will be lower then 4.2v give the 6p row would be full first and the BMS will stop charging. I used a old 18650 charger from my old vaping days. Your going to need to equal out all cells on that row before adding the missing battery back to it.
I have the same battery and everything. Even the packaging is the same.
It’s mandatory that, while replacing and or performing any kind of repairs; the Battery must be disconnected.
Always a good idea when possible.
Can I connect the battery directly to the hover board, bypassing the BMS?
Yes; however then the battery has zero safety features. You basically need low voltage shutoff when using it. Many Bikes/boards do this already.
@@Eric_Tennant Thank you for the reply. I have a fully charged battery but, when connected to BMS, it does not power on the hoverboard. When I directly connect the battery (~36 volts) to the hoverboard, the hoverboard powers on.
I'm fed up with troubleshooting this darn thing and plan to just ride out the charge in the battery, until it's depleted, then throw everything away. Is that safe, as long as I don't charge the battery?
Sounds like a bad BMS or one of the Column of batteries is not charging. You could ride the battery one last time. It will only damage the battery when the voltage goes to low.
I have to say for someone new to ebikes you sure know your electric stuff. Just curious on how and why. I also share a lot of hobbies that you do, like all the ebike stuff. If your ever in Boulder Colorado lets ride and sing ole songs!
Thanks. My wife says I need lots of hobbies so I don't drive her nuts. Will do when ever I can get up there again, I love Colorado.
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Battery still going strong: czcams.com/video/1RFBhYJiAhE/video.html
I just made a 6s4p battery pack but my bms is not responding at all it's a balanced one with negative wire going to bms for protection but negative is not responding on other side i spent about 13 dollars on it it's a china one
Double check to make sure the balance wires are in the right order. Also check If any rows are under 3.0v. If not them you may of got a bad BMS.
@@Eric_Tennant thanks for your reply I am just sitting here and trying to get a response on a professional but you replied thanks and I did what you said yes 1 of the cell is 2.5 v and I removed it now I have to spot weld the replace battery
@@malindurajapaksha1791 Helps to have them all charged to 4.2v before linking them to prevent adding dead cells. Most BMS balancing features lack the amps to fix a out of balanced battery.
I added a Neey cable to all of the batteries I have to keep them maintained and balanced. czcams.com/video/zMOUt7dSupM/video.html Be safe!
@@Eric_Tennant it's all new from Sony 1 battery was like 12 dollars but I bought 50 of them. Update now it's working. so that mean the China bms is good? Now I am discharging All of them because I didn't sure about these batteries they are original Sony batteries but you know can't trust anything now days
@@malindurajapaksha1791 Nice happy its working now. The bms was doing it's job as far as low voltage disconnect goes.
i dont do bms's I only charge with custom batteries i made with balance cables and hobby charger that shows all the cells voltages on a display can't trust the red/green light of a bms... I had 4 ebike batteries from Amazon fail....
I have found that BMS do a poor slow job a balancing. I do need to get a hobby charger at least to make fixing them easier.
I think im gonna buy a rc hobby bms so then u can see what sell is doing what from that bms cable also u can charge the individual packs to 3.7 so it ballances it so u dont have 2 take em appart that far i think after many video's thats the safest smartest and quickest way but my bms is locked out so i have 2 solder a New bms to it then ballance so the bms is detecting that all is good what a work but this is a handy video what not to do 😂
czcams.com/video/eQ1FLXeUgWw/video.htmlsi=c__onTQzQnm5SSDy then im gonna do what this guy is doing with your soldering directions wish me luck maybe its smart to film it as well because battery fire video's are doing well as we😂
I use a external system to balance the battery now. czcams.com/video/zMOUt7dSupM/video.html
Thats nice i just have the bike 2 days its almost brandnew saved from the scrapper im gonna look that video its nice to learn from People Who tried stuf instead of reinventing the wheel yourself and when People share knowledge its a huuge plus
How To Upgrade Electric Bike Battery to Solar Battery czcams.com/video/rXX4FNvY6hk/video.html
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