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  1. T

    Genuine and good 18650 cells on Aliexpress?

    Others may have recommendations for reliable Aliexpress vendors but personally I prefer to buy from nkon.nl No fakes, good prices.
  2. T

    Hub Motor Bafang G310 Replacement Gears

    I've bought motors from FietsUnie and been happy with them I see they have gears listed for the G320 here; https://www.fietsunie.nl/BAFANG-FM-G320.250.R-Nylon-tandwielen I don't know for sure, but I suspect the internals of the G320 are the same as the G310 / G311 as all the specs are...
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    kWeld - "Next level" DIY battery spot welder

    The shop only appears to have the Kcap that comes prepopulated with 6x BCAP0310, wasn't there previously a board-only version for people supplying their own caps?
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    LiGo vs LiGo+ Battery Modules

    Different cells inside. LG MG1 vs Samsung 30Q. The latter are rated for higher current. Fewer modules implies higher current demand per module. Note that higher current is not universally better, cells are always a compromise between energy capacity, power (current), cycle life, cost, etc etc...
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    Top 3 (18650 cells) for high continous Amp output?

    More info needed, it depends what you mean by high amps. What is the full spec of the bike and how big a pack are you willing to use? What kind of cycle life are you hoping to see? etc etc
  6. T

    3D Printed Hailong/Reention Style E-Bike Battery Case

    PETG is great. Less ultimate strength than PLA but not brittle. The bit of ductility / flex makes it far more impact resistant so more useful in a lot of utilitarian applications. Print a bit hotter for better layer adhesion, I'm using 90/250 (85/240 first layer) and the print is still very...
  7. T

    Please review this before I place an order

    Is a derailleur an option? The sim suggests that in this power class a GMAC can be far stronger than a TCDM at low speed if fed enough current whilst retaining regen.
  8. T

    3D Printed Hailong/Reention Style E-Bike Battery Case

    I haven't given much thought to the lock yet. Default option would just be a similar lug extending into a recess in the battery instead of from the battery into the base but I would hope to come up with something more compact. Blutooth is for the smart BMS (long thread in this forum, usually...
  9. T

    3D Printed Hailong/Reention Style E-Bike Battery Case

    Google photos links work, thanks. :thumb: As printed the upper case looks kinda flimsy, but then I don't have it in the hand and I guess it's mostly just an umbrella with the base providing all the structural strength? I plan to build the locking mechanism into the base so each bike has a...
  10. T

    3D Printed Hailong/Reention Style E-Bike Battery Case

    Your images are not loading for me. I'm working on my own designs and might have one assembled in the next few days. I'm not specifically aiming for Hailong/Renton compatibility, I will do my own quick-release base but will probably look at how to adapt to those mainstream plates as it might be...
  11. T

    BMS question

    Note that when using a 16S BMS as a 13S (if supported) its not necessarily the top few wires that are left unconnected. My BMS has a range of 10S to 15S and when used as 10S the connectors excluded are 5,9,10,14,15
  12. T

    Making slotted nickel strips?

    I once saw a 3D print of a micro table saw using a Dremel with these wheels. I'm going to make one and add a little sliding caddy to make it easy to cut consistent slots. Should also be possible to cut a few strips simultaneously Need to finish some battery case designs first though. Edit -...
  13. T

    kWeld - "Next level" DIY battery spot welder

    Chinese elephant, running 300 - 500% overrated.
  14. T

    kWeld - "Next level" DIY battery spot welder

    I can vouch for capacitors doing exciting things when abused. Kind of an irrelevant anecdote but; I was once standing in a room directly above our high current testing where we had a big bank of caps each about 3ft tall and a ft square. Max controlled discharge was about 200,000A and a *lot* of...
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    Awesome study / information on NCA battery degradation (Panasonic NCR18650PD)

    I can imagine a few reasons; The next ride isn't necessasarily the following morning commute. If it was then starting charge with a timer in the early hours to be ready just before riding would be the most battery friendly. If use is more ad-hoc then it makes sense to keep topped up and rely on...
  16. T

    18650 spot welding -how to- ULTIMATE REPOSITORY

    Whats the problem with the early K-weld? I have a relatively recent one and although I've only done a few test welds so far it seems to perform exactly as advertised, ie works great!
  17. T

    2018 Torque Arm Tests, Splined Interface Design and Tabbed Washers

    Will there be a front wheel GMAC, or is it too crowded to fit this kind of torque arm?
  18. T

    Fantastic BMS And Where To Find Them (?)

    Oh. Thats pretty disapointing, hope they sort it out for you.
  19. T

    Fantastic BMS And Where To Find Them (?)

    About 4x the price of a chinese version but given you previous experience & requirements that might be a non issue for you; https://www.energusps.com/shop/product/tiny-bms-s516-150a-750a-36 I haven't used one, but they appear to be well made with top spec parts. Very compact, smallest I've...
  20. T

    bluetooth BMS?

    Could anyone please advise on their approach to soldering the B- & C- wires to these BMS. I have a couple from James at LTT power and the pads for these connections seem very small, there isn't much 'meat' around the hole to solder to. Also, on one side they don't actually even connect to the...
  21. T

    Panny or Sanyo?

    I don't quite follow your reasoning here. Just because you don't abuse high capacity cells with excessive current doesn't mean better longevity than high power cells (which are inherently more resistant to such abuse due to lower IR). Comparing high capacity with high power, with both types...
  22. T

    mega copper battery spotwelder

    Yeah, stay tuned next month for a thread asking where to procure plutonium for a home made reactor powered spot welder.
  23. T

    bluetooth BMS?

    Do you mean a BMS that fits within the footprint of a single cell, ie 18 x 18 x 65 ? (Edit - or maybe you're asking for longest BMS dimension to be no more than cell length?)
  24. T

    Clarification on the 20% Rule

    80% is fine. Most of the benefit comes from avoiding the top 15%. Below 80% you're into rapidly diminishing returns. 50% is ideal for longer term storage. Vacations, winter hibernation, that kind of thing. No need for getting out of bed in the middle of the night to last-minute charge before...
  25. T

    bluetooth BMS?

    That's really the job of the charger rather than the BMS. There are sophisticated programmable chargers like the Grin Cycle Satiator that allow you to configure difference charging regimes and switch between them easily. Cheaper option is chargers that have two target charge levels and a...
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