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 good to go until I used it. It was right before winter last year and I had time for one test drive before I parked it for the winter. It ran really good. I had a hard time keeping the front tire on the ground with the sabvoton 72150 and the cromotor combination. This is where things go south. For some reason the motor quit running when it hit 79.8 volts. I had to stop testing due to snow so I still have too many volts in the battery for storing. So I hooked up my charger but never plugged it into the wall to slowly drain the battery. I kept my eye on the voltage and when it got down to 69 volts I took the charger off to stop the drain and parked it for 3 months. Then, 3 months later, I recharged the battery. It charged to 78 volts my charger's green light turned on and it wouldn't charge anymore telling me that it was a full charge. Then I rechecked the battery. On the ground end of my battery all 12 batteries read 0 volts. So now my battery is really only running on a 19s 12p. I had to ride it to discharge the batteries a little and so I could check it again. It quit running again. This time at 70 volts. I have the cutoff set at 55 volts.The ground row was 0 and the row of 12 next to the ground end was only reading 2.38 and all the other rows were reading a fairly full charge. I seem to be killing a full row batteries at one time. I assumed the battery would drain even but I'm new to all this and am not sure. Is there anyone that could help me out with this? I have a ton of money into this battery and it's killing me.
Also...Can I revive the row of 12 that are dead? Thay were brand new batteries. (Sanyo GA18650)
Any and all help would be greatly appreciated.
Also...Can I revive the row of 12 that are dead? Thay were brand new batteries. (Sanyo GA18650)
Any and all help would be greatly appreciated.