I’d love to give your BMS a shot if you’d be up for sending it to me!
This is salvageable. One of the rows is under voltage, but not enough to trigger a complete shutdown. You may be able to open it and bring the row up manually and then charge as per normal.
I resurrected one like this. Once up, it did take intermittent charging over 2 days to bring it fully to life again though.
That’s weird you say that because this is the first one I opened and took even the cell case out. The total voltage of the entire battery is 5v and 4v are coming from the top groups. Most of the cells read 0v or next to 0v, I’m surprised turning it on doesnt go to red.
I think my only hope would be combining the two red batteries since about half went bad on each but how is that possible at all? Unplugging the battery went instantly red and half the cells are 0.Xv like how did the cells even do that?
anyone know the name/product-number for this smd Fuses (F1, F2)?
There are very tiny numbers on the fuses. If you have a board you will be able to see them.
Bel Fuse Inc. (VA) / 0680L4000-05
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Thats a different fuse.
slow fuse 4A should fit
These were only installed on the old BMS. The new BMS no longer have fuses.
The 2018 BMS didn’t have fuses.
The 2020 BMS does have fuses.
I don’t have newer than 2020 so can’t comment on those.
I see, will do, thanks for the advice!!
Quick update on my side: I plugged everything back in after balancing the pack properly and nothing, so i plugged the battery into the charger and got a reset, then straight to 2nd and 8th red LED, which according to the above LED status description means “Severe Cell Under-Voltage Fault”. It clearly got under voltage in the past so it means the BMS will not forget severe faults.
I am not even sure we can reset these fault through the CAN bus, even if we decoded it. Ideally we would have a HEX file to flash a new firmware to the ICs but we’ll never get our hands on that.
Regarding fuses, before soldering new ones on, you guys should just remove the blown ones and solder a little piece of wire just for testing purposes. If it comes back to life then order the proper part and solder it back on.
If anyone has a spare BMS I could try out on my battery let me know, I am located in France and the US. Thanks!
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I would think, the best solution for this error is, to sniff the can-Bus-communication and simulate it with an microcontroller. Then you can change the BMS or the complete battery. Has someone tried to decode the communication?
I did the work to extract the CAN BUS communications from a working battery and a non working battery, posted all the files I had on hand somewhere above but I don’t really have the skills to decode it and no one took up on it.
I used an Arduino and a MCP2515 to intercept the CAN coms. I got that setup working again yesterday and when I have a bit of spare time I tinker with it. I will soon try to record a battery reset message and then send it from the arduino. Wish me luck!
If someone wants to take a crack at decoding the hex file from the CAN bus here is the link to the files.
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Can you tell, which signals are send from the battery and which are send from the controllerbox?
Lithos use can2b, not sure if that helps.
You can work that out from looking at the can files. I took a short look. The best way would probably be to use a script to convert the hex to decimal and then figure out what’s happening.
The basics would be looking for messages about:
- Total voltage
- row voltages
- temperatures
- error messages
- turn on relay
- shut down relay
Hello to every surfer and engineer who is here!
First of all, I want to say that I’m really excited by this community - how smart and original it is.
You are all creating the future of boarding boards, that is really incredible.
Right related to the topic:
I have the Lift battery pack from 2017. The guarantee and other perks of course are already expired. And right now I’m trying to tackle the problem of “Severe Cell Under-Voltage Fault” when the second and the eight lights are red. Unfortunately, I don’t have 3500$ to solve this problem with an order of the new battery, plus I’m the person who like challenges - so I’m here)))))
As I see a lot of people already opened the battery and messed with the cells, but did anyone got the voltage back to the right level? Please, if so, send me some more information. I’m ready for any difficulties, and i really need to try something because there will be soon my father’s birthday and I want to make a present of the fixed surf))))
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Hello Roman,
I’m now at my second older gen Lift Battery down… I have opened both, replaced the dead cells in one but was not able to get any of the two BMS to reset, they still display the fault. I tested many hardware systems on the BMS but couldn’t find anything wrong so at this point I assume the microprocessor just stores a hard fault code.
I would need to spend a lot of time decoding and experimenting with the CAN interface, then maybe reset the battery if possible or make my own to interface with the charger and ESC via CAN. Needless to say it would be time consuming. I was hoping to get some help on that front but no one has tackled the project yet.
Sorry I can’t be of any more help.
I spent a bit of time looking at the files I have gathered and I did write a quick HEX to DEC python script. I modified to include only unique codes (no repetition, just makes the file bigger) and here is the result of the good battery file I have:
[1802, 1, 127]
[784, 8, 255, 0, 0, 17, 0, 255, 6, 255]
[770, 4, 0, 0, 0, 0]
[772, 4, 0, 0, 255, 255]
[785, 8, 234, 0, 220, 5, 65, 2, 255, 255]
[786, 8, 255, 255, 255, 255, 0, 0, 63, 1]
[801, 8, 21, 14, 51, 1, 169, 3, 129, 3]
[787, 8, 0, 0, 1, 0, 62, 5, 8, 7]
[802, 8, 6, 0, 0, 0, 222, 15, 230, 15]
[803, 8, 4, 0, 1, 0, 40, 1, 64, 1]
[804, 8, 203, 0, 0, 0, 107, 222, 0, 0]
[820, 8, 0, 0, 0, 0, 0, 0, 0, 0]
[900, 8, 0, 0, 0, 0, 0, 0, 0, 0]
[787, 8, 0, 0, 1, 0, 62, 5, 3, 7]
[804, 8, 149, 160, 0, 0, 107, 222, 0, 0]
[816, 8, 227, 15, 227, 15, 229, 15, 230, 15]
[896, 8, 49, 1, 48, 1, 64, 1, 57, 1]
[787, 8, 0, 0, 1, 0, 172, 5, 17, 7]
[804, 8, 204, 211, 0, 0, 107, 222, 0, 0]
[817, 8, 222, 15, 222, 15, 225, 15, 225, 15]
[897, 8, 57, 1, 49, 1, 48, 1, 40, 1]
[787, 8, 0, 0, 1, 0, 81, 5, 3, 7]
[804, 8, 126, 211, 0, 0, 107, 222, 0, 0]
[818, 8, 227, 15, 228, 15, 226, 15, 226, 15]
[898, 8, 0, 0, 0, 0, 0, 0, 0, 0]
[1022, 4, 52, 9, 0, 255]
[1793, 1, 5]
[138, 8, 0, 0, 0, 0, 0, 0, 0, 0]
[808, 8, 174, 0, 141, 1, 53, 4, 35, 16]
[1020, 8, 8, 0, 14, 0, 14, 0, 255, 255]
[804, 8, 106, 208, 0, 0, 107, 222, 0, 0]
[819, 8, 0, 0, 0, 0, 230, 15, 230, 15]
[899, 8, 0, 0, 0, 0, 0, 0, 0, 0]
[811, 8, 19, 6, 10, 0, 0, 0, 187, 148]
[809, 8, 35, 1, 40, 1, 140, 1, 200, 1]
[976, 8, 0, 0, 0, 0, 0, 0, 0, 0]
[787, 8, 0, 0, 1, 0, 77, 5, 3, 7]
[804, 8, 190, 204, 0, 0, 107, 222, 0, 0]
[787, 8, 0, 0, 1, 0, 110, 5, 8, 7]
[804, 8, 37, 201, 0, 0, 107, 222, 0, 0]
[787, 8, 0, 0, 1, 0, 120, 5, 12, 7]
[804, 8, 162, 197, 0, 0, 107, 222, 0, 0]
[787, 8, 0, 0, 1, 0, 143, 5, 12, 7]
[804, 8, 139, 192, 0, 0, 107, 222, 0, 0]
[804, 8, 224, 186, 0, 0, 107, 222, 0, 0]
[787, 8, 0, 0, 1, 0, 105, 5, 3, 7]
[804, 8, 82, 183, 0, 0, 107, 222, 0, 0]
[787, 8, 0, 0, 1, 0, 67, 5, 8, 7]
[804, 8, 197, 186, 0, 0, 107, 222, 0, 0]
[804, 8, 223, 189, 0, 0, 107, 222, 0, 0]
[804, 8, 75, 192, 0, 0, 107, 222, 0, 0]
[787, 8, 0, 0, 1, 0, 124, 5, 8, 7]
[804, 8, 209, 193, 0, 0, 107, 222, 0, 0]
[811, 8, 18, 6, 10, 0, 0, 0, 187, 148]
[787, 8, 0, 0, 1, 0, 143, 5, 8, 7]
[804, 8, 63, 195, 0, 0, 107, 222, 0, 0]
[787, 8, 0, 0, 1, 0, 105, 5, 8, 7]
[804, 8, 129, 196, 0, 0, 107, 222, 0, 0]
[804, 8, 66, 197, 0, 0, 107, 222, 0, 0]
[804, 8, 17, 198, 0, 0, 107, 222, 0, 0]
[787, 8, 0, 0, 1, 0, 86, 5, 8, 7]
[804, 8, 10, 199, 0, 0, 107, 222, 0, 0]
[0, 2, 1, 10]
[804, 8, 163, 199, 0, 0, 105, 222, 0, 0]
[787, 8, 0, 0, 1, 0, 86, 5, 3, 7]
[804, 8, 28, 200, 0, 0, 105, 222, 0, 0]
[650, 4, 1, 255, 0, 128]
[906, 5, 1, 132, 0, 53, 0]
[786, 8, 255, 255, 255, 255, 0, 0, 62, 1]
[787, 8, 0, 0, 1, 0, 105, 5, 12, 7]
[804, 8, 104, 200, 0, 0, 105, 222, 0, 0]
[787, 8, 0, 0, 1, 0, 120, 5, 8, 7]
[804, 8, 156, 200, 0, 0, 105, 222, 0, 0]
[818, 8, 227, 15, 227, 15, 225, 15, 226, 15]
[804, 8, 202, 200, 0, 0, 105, 222, 0, 0]
[804, 8, 248, 200, 0, 0, 105, 222, 0, 0]
[804, 8, 34, 201, 0, 0, 105, 222, 0, 0]
[804, 8, 96, 201, 0, 0, 105, 222, 0, 0]
[804, 8, 150, 201, 0, 0, 105, 222, 0, 0]
[804, 8, 176, 201, 0, 0, 105, 222, 0, 0]
[811, 8, 17, 6, 10, 0, 0, 0, 187, 148]
[1162, 6, 11, 0, 162, 51, 112, 0]
[1802, 1, 5]
[1034, 7, 0, 0, 0, 0, 0, 0, 0]
[787, 8, 0, 0, 1, 0, 100, 5, 3, 7]
[804, 8, 202, 201, 0, 0, 105, 222, 0, 0]
[787, 8, 0, 0, 1, 0, 72, 5, 3, 7]
[804, 8, 207, 201, 0, 0, 105, 222, 0, 0]
[804, 8, 208, 201, 0, 0, 105, 222, 0, 0]
[804, 8, 239, 201, 0, 0, 105, 222, 0, 0]
[787, 8, 0, 0, 1, 0, 153, 5, 8, 7]
[804, 8, 234, 201, 0, 0, 105, 222, 0, 0]
[787, 8, 0, 0, 1, 0, 58, 5, 3, 7]
[804, 8, 229, 201, 0, 0, 105, 222, 0, 0]
[787, 8, 0, 0, 1, 0, 124, 5, 12, 7]
[804, 8, 227, 201, 0, 0, 105, 222, 0, 0]
[787, 8, 0, 0, 1, 0, 81, 5, 8, 7]
[804, 8, 252, 201, 0, 0, 105, 222, 0, 0]
[804, 8, 235, 201, 0, 0, 105, 222, 0, 0]
[802, 8, 6, 0, 0, 0, 222, 15, 229, 15]
[804, 8, 6, 202, 0, 0, 103, 222, 0, 0]
[819, 8, 0, 0, 0, 0, 229, 15, 229, 15]
[811, 8, 16, 6, 10, 0, 0, 0, 187, 148]
[1162, 6, 11, 0, 189, 51, 112, 0]
[1034, 7, 0, 0, 1, 0, 0, 0, 0]
[787, 8, 0, 0, 1, 0, 62, 5, 254, 6]
[804, 8, 34, 202, 0, 0, 105, 222, 0, 0]
[804, 8, 136, 201, 0, 0, 103, 222, 0, 0]
[816, 8, 227, 15, 227, 15, 229, 15, 229, 15]
[906, 5, 1, 132, 0, 0, 0]
[804, 8, 245, 213, 0, 0, 105, 222, 0, 0]
[906, 5, 1, 0, 0, 0, 0]
[1162, 6, 3, 0, 55, 57, 112, 16]
[138, 8, 48, 129, 1, 32, 128, 0, 0, 0]
[138, 8, 48, 129, 1, 30, 128, 0, 0, 0]