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  1. The Battery Doctor

    In defence of Daly BMS - Where you buy your BMS defines the defect rate

    https://www.youtube.com/watch?v=sV7UCvC4OVg
  2. The Battery Doctor

    Adjustable Chargers?

    the video you are looking for is: Is this HGJT cheap chinease adjustable battery charger better then the Grin Cycle Satiator? https://www.youtube.com/watch?v=VZWv5iWeHZI&t=1s Also no CE certified chargers have potentiometers on the PCB, only non certified chinease chargers, usually the ones in...
  3. The Battery Doctor

    Bionx Li-M n 37v battery pack rebuild attempt

    You cannot change ANYTHING on a BionX system, they where the Apple of the ebike world! Ask GRIN! They even modified the MOTORS so they could not be used by anything else then BionX controller! We have repaired a few batteries! First, if charging does not work, install a secondary BMS! We had to...
  4. The Battery Doctor

    Best connection method nickel strips <-> cable

    Looks good, are those A123s?
  5. The Battery Doctor

    Please help me choose a 21700 battery pack...

    No reention battery cases are rated for use over 1000W according to producer in germany we work with. Sure it can handle more but it will be a lot of wera and tear, like running a 250W motor on 400W. And to claim 80A is bold! Building good quality high amp batteries and HARD and most batteries...
  6. The Battery Doctor

    Willing to pay $ for guidance and mastermind needed! i want to build a 48v headway cell 16s 1p

    I can give you some advice for free. Don't trust Headway! The few times we have seen larger (premium) headway batteries they usually have dead cells and large imballance after a few years! And 8AH cannot handle 200A! Thats wishfull thinking. Boosted got busted since A123 2500mah cells could not...
  7. The Battery Doctor

    are 18650 safe overchrged from 4,2V to 5,0V?

    Overcharging does not emediatelly lead to fire, it also takes time, if you leave it on for 12-24H you are sure to see fireworks, especielly if the heat builds up. Looks you are using panasonic cells and they can take alot.
  8. The Battery Doctor

    Daly BMS lov-voltage cuttoff not working

    I'm a business client of daly, i can ask them about this, we had one BMS where the LVC did not work, so far. What can i ask them specifically. PM me. There a lots of fakes out there as well, defect being rebranded and sold on aliexpress. Please also send me the url where you bought it and maby...
  9. The Battery Doctor

    What battery connector should I be using for a 48v 1000w system?

    Always coose Amass XT90s anti spark, cheap, reliable easy to replace,
  10. The Battery Doctor

    will a aliexpress lifepo4 be always safer than a good liion

    Since lifepo4 are more expansive they might be selling you Li-ion cells which still work at 2.5-3,3V but have almost no capacity.
  11. The Battery Doctor

    Advise on battery tester equipment

    If you want a good tester then these are recommended, they are only 150W, but work with up to 150V and are very accurate, have been using such tester daily for more then 5 years, the newest version is great, review: https://www.youtube.com/watch?v=bTzYgee3fHc Aliexpress link...
  12. The Battery Doctor

    Help identifying pouch cell

    Lipo cells only have serial numbers, if you are unsure of the chimistry, charge to 3,65V with imax and se if it drops to 3,3V.
  13. The Battery Doctor

    Unbalanced escooter battery

    No, if there is unbalance then the BMS is not doing its job, or the cells are dying, you can balance them with a hobbycharger but either way imballance will trike again.
  14. The Battery Doctor

    Connecting identical packs in parallel with a single BMS

    I just did this with 4 10S5P packs, i used large 14Awg wires which is over kill. Power will only flow through in series, any imballance will be extremlly small so 24 AWG would work fine if the cells are new or of the packs have very similar capacity.
  15. The Battery Doctor

    Battery pack build longevity 80% more in series

    Do i see someone spreading false rumors? "I know that charging batteries 18650 or other lithium to 80% increases their longevity quite substantially" I made several videos debunking this: Will your Li-ion batteries last twice as long if you charge them to 4.1V...
  16. The Battery Doctor

    Testing 18650 Internal resistance using resistor and multimeter

    You must have a real IR meeter with Kelvin probes, resistance is not the same thing and IR cant be measured with a common multimeter: Does Internal Resistance have anything to do with Battery Capacity and how to test it? https://www.youtube.com/watch?v=-NKGx8u2tWY Read the comments as well.
  17. The Battery Doctor

    What does it mean to have a split BMS?

    "split" is charging and discharging are on different wires, the oposite is common.
  18. The Battery Doctor

    Dendrite build up, killing batteries

    Do i see someone spreading false rumors? "dont charge battery more than 90% /discharge less than 20% (means for a 18650 lithium cell minimum aprox 3,3V and top 4,1V ) this will also double life cycles of cells just charging up 90% , and if you charge only up 80% arround 4V will tripe or x4...
  19. The Battery Doctor

    a request for knowledge on the demise of my 30Q battery

    Unbalance like this most common when pulling more amps then the cells can handle. Yes the 30Q can handle 15A, but when you read the datashet that will leave the cells at 60% at 250 cycles. What BMS did you use? Where did you buy the cells, new or used?
  20. The Battery Doctor

    ebc-a20 tester

    I got the $300 version and its sucks. The capacity test is not correct and poor interface and just one button.
  21. The Battery Doctor

    Good 1000W ebike hub motor kits?

    Thank you but i think leafbike is not an OEM seller but a reseller of the MXUS motor/ebike kits. At least te 750-1500W version.
  22. The Battery Doctor

    Good 1000W ebike hub motor kits?

    I plan to sell 1000W ebike kits in sweden. Hub motors to be more precise since BBSHD it to hard to install for most common people. Ive been looking for some good ones and hope to get recommendations. I like the Double Gear motors on lunacycle. I also have som experiance with MAC motors from...
  23. The Battery Doctor

    Odd battery plug - whats the name?

    It looks like c13 in shape but its not in the "c series": https://en.wikipedia.org/wiki/IEC_60320
  24. The Battery Doctor

    Alternative to soldering - How is this done?

    Thank you voltron, you seem to be right on point. I now found this video on the topic yLGiY6Ehofo This is something that might work in large factories but i think i'll stick to soldering for now.
  25. The Battery Doctor

    Alternative to soldering - How is this done?

    Ive seen this method in some batterypacks. Its not solder. It looks almost glued together, it does not react to the solering iron/heat. What is this method of attaching wire to nickel called?
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