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  1. S

    A switch for shortening throttle

    Too complicated for me. Do you have it?
  2. S

    A switch for shortening throttle

    What do you think of installing an additional switch that will shorten the throttle for cruising at full power? It could be also equipped with a large linear potentiometer for having a precise manual cruising speed adjustment. Anyone tried it?
  3. S

    Critique this 3D Printed Battery - 14S10P 29E

    I'd use 2-3 RC chargers like imaxb6. You can do each time a balance charge if you split the pack into 3 and you can skip bms. You're right, bms for new 29e cells is not so much a need if you monitor voltages. Make a thick (a few A capable) balance wires on each level and get them to a place...
  4. S

    Ebike rope tow

    Great idea! What material is the rope?
  5. S

    Without BMS

    I've been using recycled laptop cells for the whole season right now. My setup has a bestechpower BMS 16s. Pack is 13p. The BMS is completely not needed in my opinion. I always charge at home or work, being nearby. I also stop charging before the BMS enters the balancing mode (it is designed for...
  6. S

    Keyed on/off switch for security?

    I bought a cheapest key switch available online ca. 1-2$ delivered. It has a very simple "round" key with just one tooth. With infineon EB318 works perfect. I even lower a step down converter directly from it to power lights and a cell phone charger. The only drawback is that you need to put...
  7. S

    Spot Welding Copper Strips to 18650 Battery Cells

    I tried this way on mine MOT half year ago and I couldn't weld 0.1 mm copper. But I experimentally checked, that definitely you need to set shorter pulse time when putting one electrode on the can. With the standard pulse I use for nickel, in case of one electrode on the can I made a hole the...
  8. S

    Common pack design mistakes, how to avoid?

    Well it's a news for me. I hope I didn't do many welds in the middle of cells in my pack.
  9. S

    Spot Welding Copper Strips to 18650 Battery Cells

    I didn't have big/any problems in soldering balance wires to nickel strips in my pack.
  10. S

    Spot Welding Copper Strips to 18650 Battery Cells

    I analyzed a stripe from a pack from Sony laptop ca. 5-7 yrs old on a SEM/EDX microscope and: 1. They used tin-plated copper. 2. This material easily spot welds on my low power DIY-style MOT spot welder. 3. the stripes have poor fatigue strength (brake easily; one Sony pack I disassembled had...
  11. S

    Can I fit a freehub on a hub motor threads?

    I have a Nine Continent RH2806 motor with a place to put 8 or 9 gears cassette. I don't know if 10 is wider than that or not, but if not, than here you have a possible solution. I had 3x9 but I decided to stay on 1x9 after few e-bike mode rides.
  12. S

    Simple range extender for Bestechpower BMS (and other also)

    Ok, I thought it's a common problem, that's why I started the thread. Regarding high range. Pretty often I drive distances of something like 40 km one way, and then I need to come back. Because many factors influence the range of the bike (eg. peddling force, wind, SOC before the trip), it may...
  13. S

    Semi hybrid system

    Thank you, actually I drive a Mazda :) Will try to take their idea into account and maybe develop an easy conversion kit if my preliminary tests succeed.
  14. S

    Semi hybrid system

    Hi guys, I can't find any information on such a system: What about separation of the electric system from the engine in a regular petrol car. Description in points: 1. Remove the belt from the alternator. 2. Add a pretty large Li-ion pack, 4S at least (CA. 14V) 3. start engine from the...
  15. S

    18650 spot welding -how to- ULTIMATE REPOSITORY

    Earlier in the thread I shared the fact that most of my battery pack is brass-tabs-based. I used 0.1 mm brass sheet, cut it myself with scissors. A sheet for all tabs for a few kWh pack cost ca 5$. But brass is weak.
  16. S

    Simple range extender for Bestechpower BMS (and other also)

    Feeling completely not understood here... But ok, guys, you can monitor, plan and etc. I just wanted to have something that prevents my stupidity of using too much amps when the battery is almost empty, causing the BMS to cut off, when the battery sags too much. Adding another 16s string to my...
  17. S

    Simple range extender for Bestechpower BMS (and other also)

    Why?
  18. S

    Infineon controller stopped reacting to throttle input.

    I had similar thing when my battery circuit unsoldered itself. It had only a single point contact, so when I got on the bike, not more than maybe 1A was flowing. This gave very little power to the wheel. After lifting the wheel it was rotating with ca. 50% normal speed. Repairing the bad solder...
  19. S

    Throttle is always accelerating

    I have the same on nine continent infineon EB318 controller. Additionally my controller launches cruise control after few secs, and it is almost impossible to hold the throttle in any position below WOT for these few secs. Fortunately I have a possibility to program 3 favorite speeds and I use a...
  20. S

    Simple range extender for Bestechpower BMS (and other also)

    Hi, I have an 16S Li-ion system with Bestechpower HCX-D131 BMS system in 16S version. The device has standard BMS functionalties, especially protects the battery from overdischarging during use. This means if you run out of juice, it cuts off the system and you can't run the motor until you...
  21. S

    What cell temperature determines its max output?

    Just guessing, maybe you'll find somewhere information on the temperature related mAh capacity of Li-ion cathodes or anodes? This should be in some scientific papers of li-ion developing research centers. But never searched.
  22. S

    Quick 18650 question.

    I don't see a problem with cells at 2 V. It's important to check if they heat up during normal charging (with a rate you plan to use) and discharging. Standard laptop cell that you are looking for should be completely cold at 1 A charge and discharge and holds min. ca. 80% of its original capacity.
  23. S

    18650 spot welding -how to- ULTIMATE REPOSITORY

    Although this design seems to be ideal, it isn't. It was discussed also in this thread before. Shortly speaking: 1. The current from each cell must go through a path nickel - copper - nickel, so it meets two additional solder joints on its way. 2. The current from side cells passes through...
  24. S

    Infineon EB318 stopped working. Power supply failure?

    Still need help
  25. S

    Infineon EB318 stopped working. Power supply failure?

    Hi guys. I've been riding a 60V (16S) system with infineon EB318 and 9C motor for ca. 2 months. It was awesome until last week, when I tried to upload new settings to the controller, and during this operation, some pins of the programming cables probably have touched each other. Then I tired...
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