Just as you can measure the voltage of individual blocks of 3 you can charge individual groups and I here would charge them to get the top bank to 3.94v each to match the lower bank. I would then put the battery on a shelf somewhere and wait a week and measure again. This will help work out if the low cells have a self-discharge problem or if they went flat because they have less capacity that the others which is terminal. The BMS will try to rebalance cells but, if you have not used the battery for a long while, self-discharge may have taken some cells so far out of balance the BMS can't fix things.Sometimes re-balancing all the cells to the same charged voltage will make the battery usable with improved range once more - for a while.
Ok. I understand that. But how do you do that? I bought a bike,and inherited a bad battery. 5 or 6 miles per charge,and that's it. How can that be fixed. I'm on a fixed income ,so I can't really afford a new battery.🤷🤷🤷
You can use power supply that allows you to set the voltage and charge each cell group one by one to a level voltage or you can use a multimeter and an old usb phone charger 5v 1a or less to charge that cell group and keep disconnecting the charger every 5-10 minutes checking the voltage until it becomes level but if your not so experience it’s best to use a adjustable power supply so you don’t risk overcharging it or anything.
Is it safe open the battery like this and check it with a multimeter if its fully charged? As I noticed you said you need to discharge it. My ebike battery is fully charged but shows 0 voltage
Thanks a lot im a newbie about repair battery it can help for me this clear video Sir Hope next video the battery of Xiaomi mi365 how to diagnose it is the same process?
If cells are unbalanced. I connected some computer fans to discharge the higher cells to match the lower cells then charge the whole pack. A bms discharge bypass could solve the cut out however you need to monitor the LVC.
Do you consider problematic receiving new lithium ion cells at 3.44v? I received my new 21700 Samsung INR 40T3 4.000mA, 35A cells from well known european company NK.. with 3.44v. Is that too low? I've builded an 2.8 kw 24s8p battery for an electric paramotor and has a huge voltage drop at 10-17kw full throttle and it should handle it like other similar batteries. I'm trying to find out why. Thanks.
3.4V charge per cell is too low for high output applications so it is normal for the voltage spike dipping too low.. Charge it up to at least 3.6V or greater per cell.
Hi. I have a lithium battery pack of 6 which puts out 7.2 volts, it charges but the charge doesn't last long only around 5 minutes,i have the same battery packs that last 20 minutes What would you suggest to do to get it back to a proper out put? Many thanks Spike.
Good video sir, Thank you.. I have one query to ask you, i purchased some lithium ion battery that are measuring different voltages for example some of them 3.6V, 3.8 V and 4.0 can I mix all cells together in parallel connection?
They should be brought to the same voltage before connected together so you should either all charge them to the max or discharge them to bring them back to a level that is close in between
So maybe i missed the answer to my question, but if you can narrow it down to a single pack can i not just disable it for lack of a better term? And then have my battery working again even if at just 2/3 of the original potential?
My 48V ebike battery shows nothing on charge indicator on actual battery. When I connect battery to bike no power, when I connect wall charger to batter nothing just green light on wall charger indicator? Any suggestion to resolve this or is there a shop who works on these? I hate to toss battery as its only 2 yrs old with little run time very few hrs.
Not only does the BMS turn off the battery pack output if the batteries are out of balance, it also turns off the charging input so the battery will not take a charge. I had the same issue on a 48V pack. I did exactly what was shown here, measured the individual packs and found one that was very low. I charged the pack with a current limited bench power supply until the voltage was back in balance with the rest of the packs and the charger then started working again.
on laptops if you change one cell the bms will cut the power and you have to reprogram it to fix the battery, in scooter doesent do that? you can change them with no problem?
i need help i have a bms which had low batteries,i disconnected the bms and i charged them all up to 3.7 so they are all balanced the bms gives 48v at the charge connector and 1.6v at the power connector...is the bms dead ?? or does it need reset or something i dont have 52v charger.
Maybe bad BMS .. it reads wrong . How much power you got in it, This charger too as low as you can and then put it on a watt meter to charge and see how much power it can draw
@@VegasRoManiacReviews changed the BMS and it didn't fully charge. Put the original one back on and it fully charged. I think its the charger. Don't have a watt meter
Some bypass the BMS output side but keep the BMS charging input. It would monitor the charge but not the discharge so you have to have a gauge to monitor the LVC yourself
nice way to blow out the battery, burn the house or whatever. Deeply discharged li-ion can grow a copper electrode or make a short cut because of dissolved copper ions in electrolite and blow up a single cell that is enough to start a chain reaction in neighbour cells. So it probably will work for a while, but then it can BOOM.
Some bypass the BMS output side but keep the BMS charging input. It would monitor the charge but not the discharge so you have to have a gauge to monitor the LVC yourself
A bms on each cell would be cool, but it would drive the price up too much of a whole battery pack. Many BMS are actually the culprit in my experience. So, on my ebike, i replaced bms board a few times, but got tired of it and now just run an RCD unit which cuts out if shorted. I closely monitor the battery when charging and discharging, and have had a few batteries like this. I have had one early on in experimenting that wasnt great, I pushed it too hard, it got too hot and I had to pull it off the bike. It wasnt enclosed, not many cells there, but was stupidly wrapped in cardboard 😂 so it caught fire. Oops. I did manage to recover most of the cells and they worked in another pack for about 18 months without a bms. If you make the batteries using good ebike battery cells, and monitor them whilst charging and discharging, and use more cells than the maximum capacity of the system, then you should be ok without a bms. But only if you know what you let yourself in for. Even with bms, these batteries are very unstable and as sensitive a woman at that time of the month. 😂 Use a bms and some kind of fuse. Dont tamper with it unless you know what you are doing and dont just think you know. Even the most experienced and knowledgeable make mistakes and these batteries are a bit mental. But great when they do operate well.😊
I think the problem is the balancing in the bms system to discharge the 4.2v cell to 3.6 and looking at all the battery if it is the same problem. Change the bms system
use a hobby charger.no bms as charger balances every time,reads cells and uses larger BMS to even pack..mind you 48 volt not good product..36 volt or 24 volt great
@VegasRoManiacReviews yes because you had only one cell per module. You had 1x3 configuration. But as soon you have multiple cells in parallel (so a module of 2+ cells) then the BMS cannot know which cell of that pack is faulty, because the voltage that BMS measures is a whole module voltage (average of cells) since the cells are connected in series. I hope I was clearer this time 😊
No it doesn't. Sorry, but no fire, no matter how badly you want it to burn.. Those fire catching battery videos are an organized crime by the high ranking elites around the world. They put something inside the battery pack to force the fire to scare the public cause they want you to stick with the heavily taxed gasoline to maximize profit. It's very evil....
You need to use eggs for examples and which one of the eggs is bad compared to the good ones, in Canada we learn about how batteries work and magnetism in Grade three science electronics are alright with me man.,PEACE!
Finally a explanation a numpty like me understands.
Good work mate
You are way above the average person , most people that watch my videos don't understand anything ..
@@VegasRoManiacReviews can we rest one battery capacity with liitokala and chane the damaged one with a battery that same capacity ??
Thank you, god of batteries. This knowledge can save lives.
That's quite a clear explanation! Congrats!
Thank you
@@VegasRoManiacReviews how to test it under load with multi meter?
good video. TY. Will you be making a video showing the actual battery replacement process?
Just as you can measure the voltage of individual blocks of 3 you can charge individual groups and I here would charge them to get the top bank to 3.94v each to match the lower bank. I would then put the battery on a shelf somewhere and wait a week and measure again. This will help work out if the low cells have a self-discharge problem or if they went flat because they have less capacity that the others which is terminal. The BMS will try to rebalance cells but, if you have not used the battery for a long while, self-discharge may have taken some cells so far out of balance the BMS can't fix things.Sometimes re-balancing all the cells to the same charged voltage will make the battery usable with improved range once more - for a while.
Ok. I understand that. But how do you do that? I bought a bike,and inherited a bad battery. 5 or 6 miles per charge,and that's it. How can that be fixed. I'm on a fixed income ,so I can't really afford a new battery.🤷🤷🤷
You can use power supply that allows you to set the voltage and charge each cell group one by one to a level voltage or you can use a multimeter and an old usb phone charger 5v 1a or less to charge that cell group and keep disconnecting the charger every 5-10 minutes checking the voltage until it becomes level but if your not so experience it’s best to use a adjustable power supply so you don’t risk overcharging it or anything.
Great video! So doesn't that BMS have Over Voltage and Under voltage protection?
It does
Is it safe open the battery like this and check it with a multimeter if its fully charged? As I noticed you said you need to discharge it. My ebike battery is fully charged but shows 0 voltage
Thanks a lot im a newbie about repair battery it can help for me this clear video Sir Hope next video the battery of Xiaomi mi365 how to diagnose it is the same process?
Thank you mate this was a very good video 👍❤
Very good explanation great video
EXCELLENT VIDEO, THANK YOU FOR SHARING. 🇺🇸 IS ❤
If cells are unbalanced. I connected some computer fans to discharge the higher cells to match the lower cells then charge the whole pack. A bms discharge bypass could solve the cut out however you need to monitor the LVC.
Well explained😊
Thanks
Great 👍
Do you consider problematic receiving new lithium ion cells at 3.44v? I received my new 21700 Samsung INR 40T3 4.000mA, 35A cells from well known european company NK.. with 3.44v. Is that too low? I've builded an 2.8 kw 24s8p battery for an electric paramotor and has a huge voltage drop at 10-17kw full throttle and it should handle it like other similar batteries. I'm trying to find out why. Thanks.
3.4V charge per cell is too low for high output applications so it is normal for the voltage spike dipping too low.. Charge it up to at least 3.6V or greater per cell.
Hi. I have a lithium battery pack of 6 which puts out 7.2 volts, it charges but the charge doesn't last long only around 5 minutes,i have the same battery packs that last 20 minutes What would you suggest to do to get it back to a proper out put?
Many thanks Spike.
Good video sir, Thank you.. I have one query to ask you, i purchased some lithium ion battery that are measuring different voltages for example some of them 3.6V, 3.8 V and 4.0 can I mix all cells together in parallel connection?
They should be brought to the same voltage before connected together so you should either all charge them to the max or discharge them to bring them back to a level that is close in between
Thank you so much sir for your valuable feedback. It will help me a lot.. 🙏🙏🙏👍👍
Excellent. Thanks.
So maybe i missed the answer to my question, but if you can narrow it down to a single pack can i not just disable it for lack of a better term? And then have my battery working again even if at just 2/3 of the original potential?
No you can't disable it , also replacing is not a good idea because the packs need to be the same age and specs ...
Nice video👍
I'm glad you liked it
How do you know how many volts are meant to be in each single battery when you test them .very helpful video thank you
Difference between weak and strong one matters more.The cells voltages are from 3V to 4,2V at full charge.
Good work
My 48V ebike battery shows nothing on charge indicator on actual battery. When I connect battery to bike no power, when I connect wall charger to batter nothing just green light on wall charger indicator? Any suggestion to resolve this or is there a shop who works on these? I hate to toss battery as its only 2 yrs old with little run time very few hrs.
Not only does the BMS turn off the battery pack output if the batteries are out of balance, it also turns off the charging input so the battery will not take a charge. I had the same issue on a 48V pack. I did exactly what was shown here, measured the individual packs and found one that was very low. I charged the pack with a current limited bench power supply until the voltage was back in balance with the rest of the packs and the charger then started working again.
So… are we just not gonna talk about that flash light sized sharpie marker? Lol That thing is huge!
on laptops if you change one cell the bms will cut the power and you have to reprogram it to fix the battery, in scooter doesent do that? you can change them with no problem?
Depends of the BMS but if you buy a laptop that is too smart then it might do that but usually the dumb stuff doesn't care and scooters have dumb BMSs
i need help i have a bms which had low batteries,i disconnected the bms and i charged them all up to 3.7 so they are all balanced the bms gives 48v at the charge connector and 1.6v at the power connector...is the bms dead ?? or does it need reset or something i dont have 52v charger.
Reset. Connect a charger.
What about a 52v samsung celled lipo battery thats not charging past 80%? Bad charger??🤔
Maybe bad BMS .. it reads wrong . How much power you got in it, This charger too as low as you can and then put it on a watt meter to charge and see how much power it can draw
@@VegasRoManiacReviews changed the BMS and it didn't fully charge. Put the original one back on and it fully charged. I think its the charger. Don't have a watt meter
40 star 💫 VID 💥✔️🔥⚡️💯💯
I can check individual cell in pack with the tester now
Some bypass the BMS output side but keep the BMS charging input. It would monitor the charge but not the discharge so you have to have a gauge to monitor the LVC yourself
nice way to blow out the battery, burn the house or whatever.
Deeply discharged li-ion can grow a copper electrode or make a short cut because of dissolved copper ions in electrolite and blow up a single cell that is enough to start a chain reaction in neighbour cells. So it probably will work for a while, but then it can BOOM.
King!
thanks
Ty
what happens if i remove the bms?
No more battery ..
@@VegasRoManiacReviews i thought if i removed it it would be fixed
Some bypass the BMS output side but keep the BMS charging input. It would monitor the charge but not the discharge so you have to have a gauge to monitor the LVC yourself
Please connection for bms 30 battery
my battery is 37 volt battery. The actually volt is 34 charger wont kick on. Does this mean my battery needs replaced
You have dead cells in it
If we know we have a problem why has it not been fixed
Perfect example of Reason to NOT use bms
Nonsense. The BMS did its job.
Guess your house will burn down quickly with no BMS my friend 😂
It saved 29 cell's.
Please explain your theory, I actually interested and not out looking to argue.
Another 🤡 on about ridiculous nonsense again it seems!
A bms on each cell would be cool, but it would drive the price up too much of a whole battery pack. Many BMS are actually the culprit in my experience. So, on my ebike, i replaced bms board a few times, but got tired of it and now just run an RCD unit which cuts out if shorted. I closely monitor the battery when charging and discharging, and have had a few batteries like this. I have had one early on in experimenting that wasnt great, I pushed it too hard, it got too hot and I had to pull it off the bike. It wasnt enclosed, not many cells there, but was stupidly wrapped in cardboard 😂 so it caught fire. Oops. I did manage to recover most of the cells and they worked in another pack for about 18 months without a bms. If you make the batteries using good ebike battery cells, and monitor them whilst charging and discharging, and use more cells than the maximum capacity of the system, then you should be ok without a bms. But only if you know what you let yourself in for. Even with bms, these batteries are very unstable and as sensitive a woman at that time of the month. 😂 Use a bms and some kind of fuse. Dont tamper with it unless you know what you are doing and dont just think you know. Even the most experienced and knowledgeable make mistakes and these batteries are a bit mental. But great when they do operate well.😊
Does somebody know what IS wrong with My scooter battery. One cell is full 4.2v and every other is 3.6v. itse 42v battery
And its says its full because one cell is full
I think the problem is the balancing in the bms system to discharge the 4.2v cell to 3.6 and looking at all the battery if it is the same problem. Change the bms system
Hi, plz I have a question : can I run a Xiaomi (250 watt) with 36v hoverboard battery?? ( I make path just a 2km in day) , plz someone answer me. tnx
Depends how that controller works I can't say for sure
use a hobby charger.no bms as charger balances every time,reads cells and uses larger BMS to even pack..mind you 48 volt not good product..36 volt or 24 volt great
How do u reset the bms
Disconnect it, then reconnect it
What if you can't drain the battery because it's not working
Still open it up and still take a look inside the cell should give you a very clear indication if they're unbalanced
What's the quick fix?!
Replace cells
Lol
Its impossible to have BMS on each cell
Physics doesnt allow it
Sure you can .. I've had a remote comtrol car that has 3 cells 3.7 volts each nut the car run at 12v total battery
@VegasRoManiacReviews yes because you had only one cell per module.
You had 1x3 configuration.
But as soon you have multiple cells in parallel (so a module of 2+ cells) then the BMS cannot know which cell of that pack is faulty, because the voltage that BMS measures is a whole module voltage (average of cells) since the cells are connected in series.
I hope I was clearer this time 😊
Very disappointing, advertised as "and FIX" and finally at the end, he says there really is no fix. Sheesh.
You need good electric knowledge to do this kind of operation or your batteries can burst in flame 🔥
No it doesn't. Sorry, but no fire, no matter how badly you want it to burn.. Those fire catching battery videos are an organized crime by the high ranking elites around the world. They put something inside the battery pack to force the fire to scare the public cause they want you to stick with the heavily taxed gasoline to maximize profit. It's very evil....
If you use average cells. They will fail. If you use a hobby charger you can stay ahead of the issue with bms DEAD IN WATER
Its not a REAL battery its just a clump of cells.
You are not a real person you are just a clump of cells
No efix explained at all. No help.
A teacher doesn't explain to you how to fix things he gives you the knowledge to fix it yourself
You need to use eggs for examples and which one of the eggs is bad compared to the good ones, in Canada we learn about how batteries work and magnetism in Grade three science electronics are alright with me man.,PEACE!
Good batteries Run Naked
Thxs man for explain this but I tink u mixed it up at 2:22 whe u sed the battery is 3cells10pacs instead of 10s3P...
I might have , good attention to details man ...