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  1. L

    Battery will not discharge evenly

    Thanks all. I drained my high cells and my charge is now up to 83.1 volts. The first four cells are now just 0.02 volts high. After I drained the high cells they were all the same which means the cells that were high went high again. When my charger is fully charged and green it will not turn...
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    balance charging 20s 12p battery????????

    Thanks all. I drained my high cells and my charge is now up to 83.1 volts. The first four cells are now just 0.02 volts high. After I drained the high cells they were all the same which means the cells that were high went high again. When my charger is fully charged and green it will not turn...
  3. L

    Battery will not discharge evenly

    Thanks for the input. I'm discharging the high cells in my pack now. Hopefully now my BMS will work properly and keep it balanced now that the cells are closer in voltage. I think the second BMS is working because it stops charging when my highest cell group reaches 2.21 volts, but I have left...
  4. L

    balance charging 20s 12p battery????????

    Thanks for the input. I'm discharging the high cells now. Hopefully now my BMS will work properly and keep it balanced now that the cells are closer.
  5. L

    balance charging 20s 12p battery????????

    Does anyone know roughly how long it should take to balance charge a 20S 12P battery pack after the charger light turns green? Batteries are Sanyo 18650GA, charger is Luna 72 volt 150amp and the BMS is SuPower Battery (batterysupports.com) 20S 150amp. I just replaced the first cell group and...
  6. L

    Battery will not discharge evenly

    Update...Repaired the battery. It only charged to 80.4 volts. It cut out and didn't want to run when it got down to 76.4 volts. When it got that low my V3 Cycle Analyst said low volts, battery flashing empty and then the screen shut off. I disconnected main power and then reconnected it. It...
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    Battery will not discharge evenly

    My battery and completed bike.
  8. L

    Battery will not discharge evenly

    I have been using my newest BMS and it seems to be discharging the remaining 19 cell groups evenly and the last discharge went all the way down to 65 volts and still wasn't cutting out. I am going to go ahead and replace the 12 batteries in cell group one and then retest. Here is the BMS I selected.
  9. L

    Battery will not discharge evenly

    They are all new batteries. Only used once. The first group charged to full at first. I killed the first group because I left the charger hooked up for a drain on the full battery for storage purposes. I didn't realize then it was over draining my first group so I kept it going and I think I...
  10. L

    Battery will not discharge evenly

    Hi all. I'm having trouble with my battery and BMS. I have a 20s 12p with Sanyo GA18650 cells. When my battery discharges it highly drains my last row of cells on the ground end of my battery. If I take volt readings right after a ride the last row of cells will read under 2.5 volts while the...
  11. L

    Battery will not discharge evenly

    I have been constantly hooking and unhooking the whole setup including the BMS and not always the same way. My BMS is external. Can I balance charge the pack with the BMS then hook the battery directly to the controller and bypass the BMS during discharge to see if it draws evenly and stops...
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    Battery will not discharge evenly

    Thanks for the replies so far. I just received my 12 replacement batteries. I'm going to try the 5v usb charger advice first...carefully. Hopefully I can bring that row back because I only used them once. My biggest concern is why that end row of cells are getting drained so much quicker than...
  13. L

    Battery will not discharge evenly

    I recently did my first ebike build. I built my own battery with books from ebikeschool.com. I built a 20s 12p. It charged to a full 84 volts. I tested the bms sensor wires many times. They started at 4.2 volts and incremented 4.2 volts all the way to 84 volts. I thought that my battery was...
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