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  1. S

    Battery troubleshooting-grab a coffee

    Great info, thank you! I just charged it today. I’ll do the tests described and document what I find and post that.
  2. S

    Battery troubleshooting-grab a coffee

    Thank you, I see. What would I use? Would it help to find a weak cell? Are there other methods? Besides tearing the whole thing apart..
  3. S

    Battery troubleshooting-grab a coffee

    I’m thinking, and when I think, I have to ask…..if I use a multimeter to measure the resistance in the separate groups, about what reading am I looking for, or, do I look for a reading that is off from the other groups, assuming there is only one group with one or more weak cells?
  4. S

    Battery troubleshooting-grab a coffee

    P.S. and maybe I didn’t slip the balancer connector on correctly as stated….
  5. S

    Battery troubleshooting-grab a coffee

    Yes! Could you please give me an example of an internal resistance measuring tool that you use? As you can tell, I’m not anything near a EE..I did not see anything corroded or leaking but that doesn’t mean there isn’t something there. Also, I need to explain how I ended up with 6 voltage...
  6. S

    Battery troubleshooting-grab a coffee

    Yes, they do drop in voltage and at the same rate after a few days, but let me go back and make sure I’m measuring where I’m supposed to be and document it. Be back in a couple of days!
  7. S

    Battery troubleshooting-grab a coffee

    Ok, just so I understand.. I have the battery pack open and the BMS sense wire connector disconnected. I measure voltage of each group. But I get the same voltage in every group. 4.1v 6 places. A few days later I measure and all 6 places measure 3.9v. There is no group lower than the rest...
  8. S

    Battery troubleshooting-grab a coffee

    Answer me this. If I bought a decent active balancer, and watched which group was always getting actively balanced, would that tell me in which cell group the weak cell(s) reside? Is that a valid test?
  9. S

    Battery troubleshooting-grab a coffee

    That is what I have been thinking. Unfortunately it involves disconnecting the cell groups and isolating the low group, then the cell or cells. Wish there was a more efficient way, but it is what it is.
  10. S

    Battery troubleshooting-grab a coffee

    Here goes. I have three 36v 13Ah batteries for my ebike. One is 3 years old and the one that came with my bike. It is in excellent shape. I then bought two more from YosePower and they are about two years old. It’s these two I want to ask about. I’ll call them Y1 and Y2 to avoid confusion. They...
  11. S

    Which hall sensor?

    Thank you. I hope I can get it out in one piece!
  12. S

    Which hall sensor?

    New to ebike repair, so this is probably a pretty basic question for most of you, but any help is surely appreciated! If you find out you need to replace a hall sensor, how do you know which one to use? Do all 3 have to match? What criteria do you need to follow? Thank you!
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