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  1. L

    Balancing a grossly imbalanced 14s14p 18650 battery

    Sounds legit. Today when I plugged the battery it made a sound of electric spark. It also made the same sound before the bike turned off once. Could it be that the controller intermittently creates a shortcut which creates high current = spark and BMS shutdown? Also the first time this whole...
  2. L

    Balancing a grossly imbalanced 14s14p 18650 battery

    Some new testing. The error 04 was my bad, I mixed the throttle and e-brake cables accidentally. Sometimes the Display only flashes, sometimes it turns on and I'm even able to drive a couple hundred meters after it suddenly turns off. I checked the phase wire resistances, they were all as...
  3. L

    Balancing a grossly imbalanced 14s14p 18650 battery

    All the voltages are from 4.0 to 4.1. No visual signs of any failure. I'm having difficulty understanding how both of the batteries could have failed. The nature of the problem has changed slightly also. Now I can't really most of the time even get the screen on (DCP-14), it only flashes...
  4. L

    Balancing a grossly imbalanced 14s14p 18650 battery

    Okay. I have measured voltages once before straight from each of the cell pack poles. I'll check those again from the BMS. The motor was once making a weird clicking sound when pedaling with PAS on. It came from the stator/rotor side of the motor. Like something related to magnets. I tried to...
  5. L

    Balancing a grossly imbalanced 14s14p 18650 battery

    I'm running the original BBSHD controller, haven't done anything to it.
  6. L

    Balancing a grossly imbalanced 14s14p 18650 battery

    Unplugging the Display after a shutoff didn't help. It still didn't power on until detaching the battery for just a couple of seconds. Then it runs okay for a few seconds up to one minute after cutting off again. I measured the voltage through the insulation of the wires coming from the battery...
  7. L

    Balancing a grossly imbalanced 14s14p 18650 battery

    Thanks for help. I forgot to mention that I opened the controller and one of the phase wires (Green) had peeled insulation so that the wire was naked for about 1 cm. I fixed it but now that you mentioned about it, could that have shorted and caused bms failure? Also, I wonder if it could be a...
  8. L

    Balancing a grossly imbalanced 14s14p 18650 battery

    Now this gets interesting. I got a second battery pack and the bike worked flawlessly with it for 50 km. Then the screen started to switch off suddenly. Detaching the battery or just turning the power on again helped for a short time (like 30s) and then shutoff again. Voltage was at about 50.I...
  9. L

    Balancing a grossly imbalanced 14s14p 18650 battery

    Well, the controller LVC was set to 45 volts and the pack actually ceased working at 47-48 volts (measured under no load). So I thought it was pretty safe. Wanted to see when it would cut the current. But yes, I'm planning on keeping the pack between 20-80% of charge to extend its life cycle.
  10. L

    Balancing a grossly imbalanced 14s14p 18650 battery

    I'll check the connections.
  11. L

    Balancing a grossly imbalanced 14s14p 18650 battery

    Alright. So I got the battery pack back from the repair shop. The first four cells had a lowered capacity (66%of 3500mAh) despite being almost brand new. They were replaced with new cells and fully charged to the same voltage as the other cells before spot welding in series. The battery worked...
  12. L

    Balancing a grossly imbalanced 14s14p 18650 battery

    I charged the battery through the charging connector in the case. It was not the balancing white that was detached from the first cell group, it was the main positive wire. How is it possible that the battery read 54 volts from the connector outside the case if the main positive was not...
  13. L

    Balancing a grossly imbalanced 14s14p 18650 battery

    Thank you for your help. Could I also just connect a single cell charger to the lowest group and let it fully charge to 4.2v? That way it would be pretty close to the other fully charged groups and the BMS could probably take care of the fine tune balancing after that?
  14. L

    Balancing a grossly imbalanced 14s14p 18650 battery

    Hello. I have been reading various threads about balancing but have not found an answer yet so I decided to do a post. I have a 14s4p 52v 14Ah battery with Sanyo 18650GA cells. My problem is that one of the cell groups (4 cells in parallel) is grossly imbalanced at 3.7v while others are fully...
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