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  1. C

    Where do you buy tabs for spot welding ?

    Hi all, I've been reading pages and pages of this forum, but I can't find a lot of information about what kind of tabs you use for spot welding,which material is better, and what are the suppliers ? Many thanks :) Flo
  2. C

    Building a 18650 cell case without soldering

    good ! but not modular and seems expensive ! :D
  3. C

    Building a 18650 cell case without soldering

    Hi Doc, thanks for sharing this method which i very ingenious and cheap, however it seems to require heatshrink to ensure nothing is moving in the battery pack, this makes changing one of the cells not so easy... also i'm not sure there is sufficient space around the cells to allow air cooling...
  4. C

    Cell discharged to 0v

    Hi silviasol, in your case maybe it was the protection circuit of the cell masking the actual remaining voltage ? Did your cells had protection circuits built-in ? Flo
  5. C

    Building a 18650 cell case without soldering

    Hi all, I see 18650 cells are gaining more popularity these days, but making a pack with these cells is not so easy and requires in much cases a spot welder... Do you think it would be possible to build a case for holding and connecting 18650 cells and also to allow easy replacement maintenance...
  6. C

    Cell discharged to 0v

    thanks for the detailed explanation ! yes I have some experience with soldering :-)
  7. C

    Cell discharged to 0v

    Hi dnmun, I always charge with hyperion 1420 with individual cell monitoring, so no bulk charging, other cells are around 3.9v so no problem with other cells I think... Is it difficult to replace the 0v pouch in a 5s turnigy pack ?
  8. C

    Cell discharged to 0v

    ok I'll try to revive it in the garden, just for fun :-)
  9. C

    Cell discharged to 0v

    ok thanks very much for the advice :) so you confirm there is absolutely no way to use the not puffed 0v cell anymore ? This make me think, these turnigy have very random quality... I may switch to 18650 for next projects
  10. C

    Cell discharged to 0v

    Hi everybody, I left my battery pack stored for several months with no checking. I recently measured the cell balancing and found that a string of 4 paralelled Turnigy 5s 20c had one cell at 0v !! So I have 4 Turnigy packs with 1 out of 5 cells at 0v, I also noticed one of the packs is puffed...
  11. C

    HS 3540 Stuttering

    Hello, I also have a stuttering problem with HS3540 and 20s battery pack. When battery is fully charged it's very easy to get stuttering when pushing the throttle. When battery voltage goes down, stuttering almost don't appear. This seems related to input voltage of the controller ... Has...
  12. C

    Ultra low cost torque arm proposal

    ok thank you for the replies, I finally bought Doctorbass's torque arm, but I'll need to cut it a bit for my frame. Flo
  13. C

    Ultra low cost torque arm proposal

    Hi everybody, I think I'm going to need a torque arm for my rear wheel motor (aluminium fork) because tha axle has started spining after only 3 runs :? The problem is that everything I see is pretty ugly with clamps etc ... What do you think about using that kind of spacer as a torque arm...
  14. C

    EMC-2000 charger from ecity (1500 to 2000W)

    Interesting finding ! But shipping cost to Europe are very high $77: almost the same price as the charger itself ... (EMC-900 at bmsbattery.com) Is there someone selling it in europe ? Or maybe a group order for europeans could make it ?? Flo
  15. C

    First Ebike build -> Big sparks, need help !!

    Hi Stanz, yes not too bad for my first electric bike :twisted:, I had to make a spark eliminator for this voltage because I couldn't connect safely the main battery wires. Speed is not as good as I expected :? -> max 50 Kph, but as I only have 5Ah pack I limited the current to 50 Amps in...
  16. C

    First Ebike build -> Big sparks, need help !!

    Hello, yes I switched two phase wires and its ok now !! I spent my afternoun riding the bike and analysing power/voltage/consumption ... It was really great !! Now I need to HK having 5s 5Ah 20C turnigy in stock, I also need to think on how to get a bike easy to charge and use everyday because...
  17. C

    First Ebike build -> Big sparks, need help !!

    Hi all, thanks for your replies I build a quick and dirty spark eliminator with 2 * 400 Ohm resistors it works fine !! Just a very little spark remaining. I now have a new problem: the wheel spins the wrong direction, I need to find out why ... Florian
  18. C

    First Ebike build -> Big sparks, need help !!

    Hi, yes I heard about that, but I didn't expect the spark to be so big, so I'm not yet convinced this is normal beahvior. Because I tried 2 times I though the second time would be less big because of capacitor charge but it was the same. Would a polarity error cause such sparks ? Maybe the...
  19. C

    First Ebike build -> Big sparks, need help !!

    Hello all, I spent today assembling my first ebike with the following parts: Crystalyte HS3540 rear Lyen 12 FET 4110 sensorless controller CycleAnalyst Turnigy Battery 20s 5Ah for test (4 x 5s batteries in serie) Everything seemed fine so after having connected the elements and check the...
  20. C

    7speed Freewheel problem HS3540 (noob question)

    ok thanks, it seems someone has the same problem.
  21. C

    New Crystalyte Motor series (HT35 / HS35 and HT24 / HS24)

    Hi mylittlepony, I'm in the same case for the freewheel, I also ordered the hub from clyte europe and they don't provide any spacer. Where have you ordered the 1.5mm spacer ? Thanks
  22. C

    7speed Freewheel problem HS3540 (noob question)

    Hello all, This is my first post on ES,first I'd like to thank every member of this forum for the great source of information they provide ! I've been reading this forum for a long time and finally decided to build an e-bike, so now the problems start :o I ordered a HS3540 rearwheel motor to...
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