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  1. Watchamacallit

    TSDZ2 - Throttle Response?

    Hi all Fairly happy owner of a modified OSF TSDZ2 (with cooling heatsinks internal and external) Currently it operates alongside a hub motor, and both share the same throttle (with very good ground connections!) For the most part i love my arrangement and it all works flawlessly, however a...
  2. Watchamacallit

    Adding a switch to (an already switched) BMS?

    I should specify that the BMS's are failing "on" almost immediately after install. Even before putting them under any load (one even before testing) - i've not been able to ride the bicycle yet. As for how they're actually turning off the BMS, i've no idea. I'm assuming it's a low current setup...
  3. Watchamacallit

    Adding a switch to (an already switched) BMS?

    Hi all. This is going to be quite a long winded, poorly written post (Sorry, I'm not the greatest at explaining things!) Patience with me is hugely appreciated. Long story short; i've had months worth of deeply frustrating BMS troubles. Largely stemming from my Hailong case not accomodating...
  4. Watchamacallit

    Burnt BMS (Pics included) Please help?

    OK so something is definitely up with these two replacement BMS's from ali express. upon connecting the first one (as mentioned post above) i had that weird behavior where it appeared to initially work, but then voltage was being supplied regardless whether it was on or off (BIG problem too, as...
  5. Watchamacallit

    Burnt BMS (Pics included) Please help?

    Ok, just did further testing. Each cell has a difference of about 0.01v, so they're fine (3.490 - 3.500 usually) I connected a charger and the bms sprung to life again. I then disconnected the charger and switched the battery off. in a switched off state, the charging port has about 20v at...
  6. Watchamacallit

    Burnt BMS (Pics included) Please help?

    Ok, so i got the BMS today from Aliexpress (The ones previously recommended) Took my time wiring it up, B- first, then C-/P-, then the more difficult balance leads. It was actually far easier than i anticipated, i was more nervous than anything else especially doing the balance leads but...
  7. Watchamacallit

    Burnt BMS (Pics included) Please help?

    Measuring using the balance lead (so negative on b0, red to b1/b2/b3 etc) and the increase is around 3.49-3.47 between each one. So for example, readings were: 3.47, 6.96 10.45 .. etc Not sure if i'm doing it right or if that increment even matters, but thought i'd bring it up just in case...
  8. Watchamacallit

    Burnt BMS (Pics included) Please help?

    Yes thats correct. I've put the multimeter to 20 vdc and i'm seeing anywhere between 0.00-0.02 difference between each pair. Thanks again for all the infomation, i'll be coming back and forth from this thread for quite some time to absorb all of it. awesome. Thanks for this. I've spent hours...
  9. Watchamacallit

    Burnt BMS (Pics included) Please help?

    Ah gotcha, thanks for the reply Being curious (and trying to grow more comfortable with the battery) i decided to measure the balance lead voltages, which gave me 3.5 to 3.4v variance increases going up each bank Is this a good sign? Would I be right in thinking this shows that the battery...
  10. Watchamacallit

    Burnt BMS (Pics included) Please help?

    Nope, it really is a requirement lol, hence me saying so. My setup is very specific and space is of a premium so they're all hard requirements without giving myself a greater headache. The bicycle it's all powering is a highly custom build. Everything else i've managed to modify and change but...
  11. Watchamacallit

    Burnt BMS (Pics included) Please help?

    By both directions i assume you mean reversing the multimeter cables on the drain/source? In which case i get the same result. Doesn't sound good then? I was hoping to find replacements that at least exceed the quality of this BMS but i suppose thats always going to be a gamble. Looking on...
  12. Watchamacallit

    Burnt BMS (Pics included) Please help?

    So i checked the voltage of the burnt out FET between the source and the drain (the tab at the top of the fet itself) and it measured 0 voltage, so i then did a continuity test and got a positive/beep. Based on this, I guess the fet has failed on and would charge the pack to annihilation given...
  13. Watchamacallit

    Burnt BMS (Pics included) Please help?

    Would it be worth me replacing the charging FET at least? Just to rule out any possible risk of failure or damage from the first overheating? Would it be the same FET as the others? the writing on the charge FET has disappeared from the heat damage.
  14. Watchamacallit

    Burnt BMS (Pics included) Please help?

    Massive thank-you for taking the time to write this out, just what i needed and has put me at ease a little. So the overall gist is that it's mostly OK in it's current state but, preferably, maybe it's better to replace it? Or is it ok to just clean it up and reassemble it in the pack? I assume...
  15. Watchamacallit

    Burnt BMS (Pics included) Please help?

    It was through an online UK shop that no longer exists so i'm afraid i couldn't tell you. No branding on the batteries either, only the typical Hailong casing logo's, So my theory is it was the uk shop that built them and they used whatever junk BMS was available at the time to cut down costs.
  16. Watchamacallit

    Burnt BMS (Pics included) Please help?

    Hi all. I should probably warn you that i'm fairly anxious right now. Im very aware of how dangerous these batteries can be and i'm desperately trying to find solution(s) to this problem. So a bit of patience and understanding will be hugely appreciated: So for the last 2 years, ive owned two...
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