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  1. KevMca

    BMS not charging or discharging

    I tried this. It ran the ebike no bother at all! It ran the motor with no sign of struggling in any way. I also plugged into the charger and it charged away there for a minute or two. So from that, I'm pretty sure it's not an issue with the battery. So it's definitely an issue with the BMS alright.
  2. KevMca

    BMS not charging or discharging

    Please refer to here v I can't send a photo because I'm not near the battery.
  3. KevMca

    BMS not charging or discharging

    I don't know what that means exactly. That big copper bus bar connected at B- on the BMS connects straight to the negative side of the battery pack. I don't know what you mean by the heat would destroy the BMS though :| There's no shunt, which I assume you mean a current shunt for some...
  4. KevMca

    BMS not charging or discharging

    I believe it is the side closest to the edge of the board. These two images show the front and back of the board. As you can see, the pad on the left of the B- sign is only on the back and not the front.
  5. KevMca

    BMS not charging or discharging

    Thanks serious_sam, If I don't get this working I might look into that. Thanks docw009, I thought it could have been a problem with connectivity between the cells alright. I filed down each of the copper strips and tightened them down good and tight to get good contact. That being said, there...
  6. KevMca

    BMS not charging or discharging

    Alright lads, So I changed out those cells now and I now have a battery with the following voltages: B1: 3.53V B2: 7.1V B3: 10.7V B4: 14.3V B5: 18.0V B6: 21.6V B7: 25.2V B8: 28.8V B9: 32.4V B10: 36.0V B11: 39.6V B12: 43.2V B13: 46.8V There is still a 43V between P- and positive and 44.5V...
  7. KevMca

    BMS not charging or discharging

    I think the low battery voltage is an issue because (according to banggood) the BMS cuts off at 2.55V and releases at 3.0V. As you say, some discharge curves go down to 2V, so I'm hoping I can revive them. I'm going to trickle charge the low cells back to 3.6V using a variable power supply and...
  8. KevMca

    BMS not charging or discharging

    Thanks, It's neat but it doesn't work XD I had a home built 13s battery before this, but I haven't used a BMS before, so I thought I could just be misunderstanding something. B1:2.58 B2:3.60 B3:3.59 B4:3.60 B5:3.60 B6:3.60 B7:3.60 B8:3.60 B9:3.60 B10:3.60 B11:3.60 B12:3.60 B13:3.60 Those are...
  9. KevMca

    BMS not charging or discharging

    Thanks for the reply, I have connected both the negative balance wire and terminal, I forgot to mention that previously. I have also checked each of the balance wires at the BMS PCB and they all seem to connected correctly as well. That's my setup there. It is essentially solderless, so I...
  10. KevMca

    BMS not charging or discharging

    I have a newly built 13s li-ion battery using the NESE battery modules. I have a cheap 13s BMS from banggood (https://m.banggood.com/13S-35A-48V-Li-ion-Battery-Protection-Board-BMS-PCB-with-Balance-For-E-bike-Scooter-p-1286039.html?rmmds=search#popupStatedetail). It's model is cf-60v20a-a. The...
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