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  1. 1

    Smoking Heat Sensor

    Thank you to all that contributed to this thread, the STW40N65M2 arrived and works a treat, I am now putting back the two cells I removed so it will be back to 42v/36v
  2. 1

    Smoking Heat Sensor

    There are lessons to be learnt from this project and still a few questions. I was concerned about the smoking of the drill after replacing 30 NiCd cells with 20 x 18650 (10s2p). So I removed two of the cells, the total of which were supplying 42v which still left it with 37v. What I should...
  3. 1

    BMS voltages on C- & P-

    So I got the new 35A BMS, I plugged in the balancing cables, I have not soldered the thicker negative cables yet but I thought I would check the voltages to see if they resolve the problems above. So I put one probe on the Battery Main Postive terminal, I then tried each of the Negative solder...
  4. 1

    Do I need to change these wires

    I planned to make a 10s battery with just 10 cells, I bought a 16a BMS Later I got hold of 20 decent cells so I decided to make it a 10s2p battery I got a new 35A BMS although the cells are 20A So the new unit arrived and it has thicker cables. As the cables for my old BMS are already...
  5. 1

    BMS voltages on C- & P-

    Yes all wires go to right cells I unplugged it as I am replacing it. It is the type with different port.
  6. 1

    BMS voltages on C- & P-

    This is new one I bought
  7. 1

    BMS voltages on C- & P-

    Sorry for delay in reply, I must have missed the email notification I have since found that this BMS unit was 16amp, I originally planned a single 10s setup but ended up witing two together, which are 20A, so I have now ordered a 35v
  8. 1

    Earth Terminal on Battery

    So should I ditch it or try to attach it to one of the 18650 cells?
  9. 1

    Smoking Heat Sensor

    Thanks I have ordered a STW40N65M2
  10. 1

    Smoking Heat Sensor

    How can a 36v drill have a max of 20v what is threshold voltage, the amount it needs to turn on? Any recommendations of something powerful enough?
  11. 1

    Smoking Heat Sensor

    The voltage is 36v 20amps
  12. 1

    BMS voltages on C- & P-

    I was extremely careful to check all the balance leads. The battery was recycled so it has solder in place for all the balance leads. I was really hoping for a response from someone who has a battery BMS and can measure it or who has actual relevant experience of the issue I have raised.
  13. 1

    Smoking Heat Sensor

    I have this drill that I am converting to 18650 When I pull the trigger it starts smoking, so I opened it up and it seems to be some sort of heat sensor. You can see from the pic that the heat sensor chip is wired into the trigger, and sits on a heat sink. Does anyone know of a more powerful...
  14. 1

    BMS voltages on C- & P-

    I installed a 36v BMS, all seemed fine, when I tested the voltage I noticed B- Battery is at 36.6v P- Load is at 18v (approx) C- Charger is at 18v (approx) The device drawing the load would not work at 18v Has anyone come across this ?
  15. 1

    Earth Terminal on Battery

    I have converted an Ni-Cd 36v drill battery to an 18650 battery. The connector to the drill has the obvious positive and negative terminals, but it also has an earth terminal. This has a black wire going into a silver thing (red arrow below), then another black wire comes out and was soldered...
  16. 1

    Is this BMS Diagram WRONG or is it ME?

    Thanks for your reply It does indeed come with the first black wire which as you say goes to the negative of the far right cell. The way I understood it, is you start from the black wire, then just follow the current through the cells, putting the next red wire on the next positive it passes.
  17. 1

    Is this BMS Diagram WRONG or is it ME?

    I have been building a 10s battery and saw this BMS wiring image online At first glance is seemed a great way to visualise the BMS wiring, but on closer inspection I think a mistake might have been made, the error seems to be in the numbering of the wiring on the bottom set of...
  18. 1

    Can you use a 10s BMS as a 9s BMS

    If you read the first post you would see why the "oddball config" "The problem I had was that my battery was producing around 42v and something in the connector area inside drill started smoking!" To get a boost or buck converter I would need a high amp one, so cheaper to just buy a 36v one...
  19. 1

    Can you use a 10s BMS as a 9s BMS

    If I buy a 36v charger I imagine I am losing something, 42v is waaaay to high, so how much could it take, 38v, 39v, 40v (If I can find one).
  20. 1

    Can you use a 10s BMS as a 9s BMS

    Thanks for your reply and for clarifying the function of the BMS. So I guess I will have to go buy a 36v charger Does anything on the ebay listing suggest it may vary, I am still wondering what that 36v is on the box. Unfortunately I only have work phone and it is locked down to prevent me...
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