The port hole

Ok so I have the BMS connected and charging the battery .

Please see attached

I am watching it charge on my I pad I like this !

Still have to work out the Parameter settings and what they do exactly.

So far on YouTube, I’ve seen that it’s good to have battery data but so far it’s charging correctly and has recognised10s and I have inputted the 9.9 AH.

I will stop it charging when it reaches 42 V out what I need to do next.

I think these will be excellent replacements for the Carrera STL batteries, but just the standard 10 S Bluetooth as we loose the power indicator so to have it on the mobile is a good improvement.

More

I have run into some issues with this BMS now .

It’s shutting down and I am getting an

Abnormality message I suspect it’s in the parameter settings i.e. I have not set them yet as I’m not sure how to set them for this battery. I’ve also tried another one on a STL Carrera battery which was already charged up at 41 V.

Both battery packs are balanced and they’re in good condition so I’m just not getting on with this. Been looking at the manufacturers website and some YouTube videos, but they’re not really specific to this particular Bluetooth.

Any help would be appreciated

Bluetooth BMS

Looking at this as a layman, I can see that there are four channels on this BMS that are not connected.

Could that be because you are using it on a 36 volt battery, although it has four more channels than the ten you have connected.

If that is the case, it is seeing unconnected channels as flat cell groups. Either it is the wrong BMS for a 36 volt battery, or you need to configure it to ignore the unused channels (if that is possible - this is a guess).

Edited May 4May 4 by Tony1951

Yes, that may be the problem. According to the diagram, the last 4 pins of the connector should all be connected to the top of cell 10, which is the one that measures 42v when fully-charged, and I think you marked on your sheet as white to purpul 38.3v.

3 hours ago, Tony1951 said:

Looking at this as a layman, I can see that there are four channels on this BMS that are not connected.

Could that be because you are using it on a 36 volt battery, although it has four more channels than the ten you have connected.

If that is the case, it is seeing unconnected channels as flat cell groups. Either it is the wrong BMS for a 36 volt battery, or you need to configure it to ignore the unused channels (if that is possible - this is a guess).

I think I have charged the battery without first setting the parameters so now it’s shutting down because of this so I think I need to discharge it and start again.

The BMS is supposed to recognise I think it was 7 to 14 S so the unused channels in the voltage parameter are either zero or whatever string 10 is i.e

I’m gradually finding videos to watch. I have contacted the shop to get some advice as they are there main outlet for these particular BMS boards.

The problem I’m getting on YouTube is that the videos that sort of tell me what to do or off different batteries and BMS boards I haven’t had time yet actually just sit there and study them.

2 hours ago, D8veh said:

Yes, that may be the problem. According to the diagram, the last 4 pins of the connector should all be connected to the top of cell 10, which is the one that measures 42v when fully-charged, and I think you marked on your sheet as white to purpul 38.3v.

They are all connected to cell 10 as in the wiring diagram, but when I go to set the parameters on the max voltage section I have tried doing the zero and 4.2 V and it still shuts down so I think it’s something else in the parameters as it did not do this until it was charged as in the photos I posted of it actually charging.

I will discharge it again. I have started to do this running the motor on a throttle rather than taking the battery out and discharging it on the balance charger which I have yet to set up .

So basically, I think I’ve jumped the gun by charging it first

I am going to order the UART cable tomorrow and see if it can be set in the parameters before power or if this will stop it shutting down as I checked all the cells and cell groups and they all seem to be fine

On 04/05/2026 at 17:20, D8veh said:

Yes, that may be the problem. According to the diagram, the last 4 pins of the connector should all be connected to the top of cell 10, which is the one that measures 42v when fully-charged, and I think you marked on your sheet as white to purpul 38.3v.

I have been talking to the JBD shop on Ali Express but they have stopped responding I have a few of these Bluetooth BMS boards .

I have tried 3 different 10s battery packs now that all seem to be fine this is a branded BMS .

Could I send you one and see if you are able to do any thing with it before I return them as I think they are well worth fitting if we can over come this abnormality message.

I’ve asked them if they do a 10 S version their reply was to tell me that custom builds are 100 MOQ.

The price is very good around 20 quid each compared to the Bluetooth BMS boards on top bike kit, but I suppose if they don’t work it’s not a good price.

1 hour ago, Baz the balloon man said:

I have been talking to the JBD shop on Ali Express but they have stopped responding I have a few of these Bluetooth BMS boards .

I have tried 3 different 10s battery packs now that all seem to be fine this is a branded BMS .

Could I send you one and see if you are able to do any thing with it before I return them as I think they are well worth fitting if we can over come this abnormality message.

I’ve asked them if they do a 10 S version their reply was to tell me that custom builds are 100 MOQ.

The price is very good around 20 quid each compared to the Bluetooth BMS boards on top bike kit, but I suppose if they don’t work it’s not a good price.

It's clear that it's reading 0v on celss 11 to 14, which is why it's shutting down. To work with a 10S battery, there must be a setting to tell it to ignore those channels. Therefore it must use one of the following ways to do that. 1. An option to select the nominal battery voltage; 2. An option to set the number of channels to use; 3. A hardware method such as a switch or jumper on the pcb.

I've just read the manual. It says that it uses the wiring to determine the number of cells. The diagram shows that the B10 sense wire must be connected directly to B+ as well as position 10 in the connector. Another diagram shows it connected to B14, and the diagram in the listing shows B10 to B14 all connected together. Try just connecting B14 to B10 and leave B11, 12 and 13 disconnected. If not that, check again your wiring.

Ok thank, I will do this let you know how I get on

Just to clarify as I am trying this on an STL 10S battery pack that is charged at and balanced at 38v as the Dafron one is still in the bike.

Just to check B10 is balance lead number 10 as in photo goes to B+ which is the positive terminal on the battery.

Then on to positive charge and discharge port?

And B- is the big blue wire on the BMS which is connected alone to - negative battery terminal

Balance lead 11 is the main balance + positive lead red that the diagram showed all the unused balance leads connected too ?

And B11 is the main positive and this takes the unused wires .

This is the exact sequence of the original balance leads 11 leads in total .

Take no notice of the red B11 not being connected at the moment I will re connect it when I do what advise .

25 minutes ago, Baz the balloon man said:

Just to clarify as I am trying this on an STL 10S battery pack that is charged at and balanced at 38v as the Dafron one is still in the bike.

Just to check B10 is balance lead number 10 as in photo goes to B+ which is the positive terminal on the battery.

Then on to positive charge and discharge port?

And B- is the big blue wire on the BMS which is connected alone to - negative battery terminal

Balance lead 11 is the main balance + positive lead red that the diagram showed all the unused balance leads connected too ?

And B11 is the main positive and this takes the unused wires .

This is the exact sequence of the original balance leads 11 leads in total .

Take no notice of the red B11 not being connected at the moment I will re connect it when I do what advise .

It's not clear, but I think you've done it wrong. The B10 wire must go to the B10 pin on the BMS. The B11, 12,13 and 14 must be joined to it, so the easiest way is to twist them together and connect them all to B+ or the battery positive wire. B10, B+ and the battery positive are all the same overall battery voltage, so it makes no difference which you connect to.

I don’t know what you've done with your numbering system, but I'm not sure it's right. You should label the wires according to their function. B0 is the negative side of cell 1. B1 is the positive of cell 1. B2 is the positive of cell 2 and so on until B10 is the positive of cell 10 and the overall battery voltage. You then look at the wiring diagram to see which pin in the connector is which, then connect accordingly. The diagram shows a B0 wire on the connector, but I don’t see it in your photos.

One other thing that just looks wrong. Where you ve soldered the wires to the cells, there seem to be extra tails. What are they? In the last photo, the tail is so long that it looks like the wire labelled 5 is joined to 3!

Edited Thursday at 13:255 days by D8veh

I also noticed in the first photo of the phone app above, it says that the battery switch is off. Have you fitted a switch?

In the second photo of the app, there's a list of things you can look at on the left side. What does it show when you click "about battery"?

Ok let me do this one at a time

49 minutes ago, D8veh said:

It's not clear, but I think you've done it wrong. The B10 wire must go to the B10 pin on the BMS. The B11, 12,13 and 14 must be joined to it, so the easiest way is to twist them together and connect them all to B+ or the battery positive wire. B10, B+ and the battery positive are all the same overall battery voltage, so it makes no difference which you connect to.

I don’t know what you've done with your numbering system, but I'm not sure it's right. You should label the wires according to their function. B0 is the negative side of cell 1. B1 is the positive of cell 1. B2 is the positive of cell 2 and so on until B10 is the positive of cell 10 and the overall battery voltage. You then look at the wiring diagram to see which pin in the connector is which, then connect accordingly. The diagram shows a B0 wire on the connector, but I don’t see it in your photos.

B0 I have numbered as number 1 but it still has the black wire coming from the balancing ribbon soldered to it so first black balancing terminal on the battery,I will change this . Ie I have no number B0 (zero).

The coloured tails left on. I just temporary just to remind me of the order of the cell groups as per my notes I was not going to leave them on.

I will read what you said and get on it a bit later today an update you once done.

41 minutes ago, D8veh said:

In the second photo of the app, there's a list of things you can look at on the left side. What does it show when you click "about battery"?

2 hours ago, D8veh said:

I also noticed in the first photo of the phone app above, it says that the battery switch is off. Have you fitted a switch?

No I have not fitted a switch yet but I have one if I have to fit one ?

The balance leads are in the right place as I re numbered then with Black becoming B0

So now B10 to 14 are all soldered to red + I will move them up to the main terminal and rig a temporary connector block so I can try taking out B11 B 12 and B13 as you suggested earlier, let you know how I get on shortly

6 hours ago, D8veh said:

It's clear that it's reading 0v on celss 11 to 14, which is why it's shutting down. To work with a 10S battery, there must be a setting to tell it to ignore those channels. Therefore it must use one of the following ways to do that. 1. An option to select the nominal battery voltage; 2. An option to set the number of channels to use; 3. A hardware method such as a switch or jumper on the pcb.

It is supposed to automatically recognise 7 to 14 S batteries.

1 hour ago, Baz the balloon man said:

No I have not fitted a switch yet but I have one if I have to fit one ?

Normally, the switch is optional, so if you leave it empty, it's switched on. The error message seems to indicate that the problem is low cells. I'm wondering if there's a setting for how many cells you have because if it thinks it's a 14S one, it'll see the voltage as too low and it'll tell you to charge it. It doesn't say cells 11 to 14 are too low, but I don't know if it has a message for that.

Please see photos so when when it connects you get a little while in the parameter settings but as soon as I get to voltage calibration 3rd screen it shuts down , a u tube video I watched said to mirror the voltages on each cell group and hit set is this correct ?

The first Two screens you can not alter NFC CONFIRM AND LMP CONFIRM IN THESE SCREENS ALL YOU CAN DO IS SET THEM BEFORE IT SHUTS DOWN .

Voltage calibration and current calibration can have input and then set but I am not sure what to do here .

Reset capacity can also be changed .

When the Bluetooth is flashing ie connected it now will also not let the battery charge as it did on the Dafron battery .

As in previous messages it is supposed to automatically recognise 10 S according to the manufacturer and I am talking to their actual shop on AliExpress or I was!

The photos are only temporary wiring and the screens are actual screens now of when I get a small window to try and go into parameters. It seems that when I start doing something in parameters it takes longer to shut down so I’m guessing that this is the problem as I I’m assure as I can be that the wiring is correct.

The problem this company has so many trying to find an actual manual for this specific BMS is difficult and the YouTube videos that they direct you to are not specific and usually much bigger batteries and solar builds .

More photos coming