MisterSandals
Participation Medalist
That is NOT even close to being a BMS. That is a battery monitor with alarm and minuscule balancing capabilities.The BMS is iSDT BattGO
That is NOT even close to being a BMS. That is a battery monitor with alarm and minuscule balancing capabilities.The BMS is iSDT BattGO
Wow, you kick puppies as well?That is NOT even close to being a BMS. That is a battery monitor with alarm and minuscule balancing capabilities.
I have said repeatedly I turned off the power.That is a battery monitor. It has no way to to stop or turn off your charger. It does do some balancing and that can help you solve the problem.
ALL of the cells were within.005 volts of each other. [please refer to the video I posted]It looks to me like the cells are out of balance and that was likely the cause of the overcharged cells .... I suspect the balance capabilities of this unit isn't sufficient for the size of your cells.
Since you are charging in series, it is very easy for this to happen. Some cells reach the knee before the others when they are out of balance and the charge levels on those cells can rise rapidly. Bad connections to some of the cells could also cause this.
As you have found out .... That can change rapidly when the upper knee of the charge is reached.ALL of the cells were within.005 volts of each other. Another one assuming.
Any one else want to ignore the videos and what I have said so far also?
That is probably true in the short term. The best short term plan is to set the charger to stop when the first cell reaches 3.5 volts.It looks to me like the cells are out of balance and that was likely the cause of the overcharged cells .... I suspect the balance capabilities of this unit isn't sufficient for the size of your cells.
I do not know how the OP ever got to this reasoning. She has posted about BMSs over 125 times since July (i searched!). Its a shame She did not mention that She was using an iSDT battery monitor thinking it was a BMS; we could have helped Her had we known (first mention of iSDT in post #40 above).BMS = Battery monitor. This monitors my battery.
Hence it is a BMS.
I suspected something wrong in #24 but didn't want to assume, but having spent 2hrs reading about the issue still wasn't sure.I do not know how the OP ever got to this reasoning. He has posted about BMSs over 125 times since July (i searched!). Its a shame he did not mention that he was using an iSDT battery monitor thinking it was a BMS; we could have helped him had we known (first mention of iSDT in post #40 above).
Hopefully his cells are ok and he somehow gets a BMS for his battery.
What I see in the video is a cell monitor, NOT a BMS. Did someone tell you this would work? Although it claims a balance function, it's designed for RC model batteries. It is NOT a BMS. This is really just a meter, and it would seem like most people who hook up individual cells to make a battery without a BMS, you thought "I'll keep an eye on it".Actually I have videos of it.
I will again post a link as it was lost in the other thread.
https://www.youtube.com/channel/UCz2CSFMvzJL_gPr-eWj-qpA
BMS = Battery Management System, not monitor.Wow, you kick puppies as well?
I was given it and it works.
So I used it and it has worked for me so far until today literally.
BMS = Battery monitor. This monitors my battery.
Hence it is a BMS.
Also it will balance my cells. It has before and it will do so again. It did it today as a matter of fact.
So I have no clue what you are on about.
Yes I was given it as a present by someone here that is rather important I am told.BMS = Battery Management System, not monitor.
Kick puppies? Seriously? Everyone is tiptoeing around the subject, so I'll be blunt. You did something you shouldn't have done, and it is NOT the fault of the vendor who sold you the battery cells. Did you ASK anyone here if the toy MONITOR would work for big honking cells? I feel for you, I really do, but really, the fault lies with your actions and assumptions, not the cell vendor, or the battery MONITOR manufacturer. It's like buying a car battery and hooking it up backwards. You damage things, and nobody to blame except yourself, not the battery manufacturer, not the car manufacturer.
Nobody likes telling you that you did something dumb, but bottom line is that you did.
She'd have to get a BMS, not really effective to reach over and flip off the power supply (she called it a charger, but it is a bog standard bench power supply). Likely didn't top balance (or bottom balance) the cells, just hooked them up in series. A cell got low, so she "hooked up the charger" and wham, we find out quickly which cells were fully charged, and which were not. I'm sorry, but even if you need a mobility scooter to get around, it isn't right to demand a vendor refund or replace the cells that your lack of knowledge destroyed.That is probably true in the short term. The best short term plan is to set the charger to stop when the first cell reaches 3.5 volts.
Longer term there may be other workarounds. Only if she is interested?