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  1. M

    Battery pack resellers in Europe!?

    German Pack sellers: Batterien-Montage-Zentrum GmbH http://www.bmz-gmbh.de/ (great prices for larger quotes, will weld per request, high power or high energy 18650-cells) Akkuteile.de http://www.akkuteile.de/ (large selection of 18650 cells, will weld cells on request, very friendly support)...
  2. M

    Rc esc wiring with motor hub

    Hi, very short answer: yes; slightly longer answer: - most, if not all E-bike hub-motors and controllers are so called "sensored" - they use (hall-)sensors to determine the motor position and power the phases accordingly. - RC-motors and controllers on the other hand (above all, airplanes...
  3. M

    Turnigy 4s 5Ah Hard Case 20C Lipo, review in the works

    I used the tip of a screw driver in the corners (the side where the cables exit has no boom-boom-pouches, so, i'd suggest to start there) - i janked it in a few milimeters, not all the way through the plastic casing - there is a little edge half way which was enough for me, and "screwed" the...
  4. M

    Turnigy 4s 5Ah Hard Case 20C Lipo, review in the works

    edit: img size
  5. M

    Turnigy 4s 5Ah Hard Case 20C Lipo, review in the works

    I've been having some trouble with my BMS-Evaluation Module (bq78pl116), got a cell down to ~1V; I was also a bit dumb there and assumed a bad cell, trying out another pack with the result that over night another cell went low voltage on me; this one though seems to be usable still. Anyways, i...
  6. M

    Turnigy 4s 5Ah Hard Case 20C Lipo, review in the works

    I just received 5 packs of turnigy 4s 5000mAh hard case batteries and will write up some info about them here. link: (Hobbyking / DE Warehouse) http://www.hobbyking.com/hobbyking/store/__16655__Turnigy_5000mAh_4S1P_14_8v_20C_hardcase_pack_DE_Warehouse_.html Starter up info They came well...
  7. M

    Noob Lipo Dummy (need a Lot of help)

    yeah, the drawing is a bit hard to decrypt ;) Hope this helps: rename B1 -> A3, B2-> B1, C1 -> B2, C2 -> B3: A1-3 and B1-3 Connect First three packs in parallel (incl. balance cables), connect last three packs in parallel and then do the two paralleled blocks in series (see fig.)
  8. M

    Noob Lipo Dummy (need a Lot of help)

    hey TC, It will work, BUT, as i understand it (anyone feel free to correct me): in case that the battery cells are not equally strong, e.g. capacity differs slightly between the individual cells, they may go out of balance. A rule of thumb it is to parallel lithium cells first, then put them...
  9. M

    U of T researchers crack full-spectrum solar challenge

    Interresting read, i liked the article about the dye sensitized solar cells "windows with photosynthesis photovoltaics" :)
  10. M

    Toshiba 20Ah SCiB (6000+ cycles, 100Wh/kg, 10C charge)

    Hey guys, has anyone been able to get their hands on any of these yet? 2.4V, 20Ah lithium titanate prismatic cells: http://www.toshiba.com/ind/data/tag_files/SCiB_Brochure_5383.pdf http://e2af.com/interview/091006.shtml http://e2af.com/interview/091009.shtml at a claimed 6000 cycles using 10C...
  11. M

    What is the difference between Lipo and lifepo4?

    Sanyo, 2.5Ah UR18650F ('laptop cell')
  12. M

    What is the difference between Lipo and lifepo4?

    LiFePO4 and Lipo are both "lithium ion" Batteries - lithium ions are used as charge carriers within the batteries (Charge: from Cathode, through electrolyte, to Anode. Discharge: the reverse; anod -> electrolyte -> cathode). generally a more or less liquid electrolyte is used (compare to the...
  13. M

    RC-ESC vs E-Bike controllers

    well, if i understand BLDC-motors correctly (which i probably don't), they have similarities with 'normal' brushed DC-motors; simply put, voltage governs the (top) speed and current governs the torque, so, when starting the motor from stand still, the speed controller takes the battery voltage...
  14. M

    RC-ESC vs E-Bike controllers

    Hey, newbie question: is it possible to add a current limiting circuit to the phase wires between the motor and (RC) esc to address the starting issue? or would this mess too much with the controllers bemf readings/pwm signals? /long time lurker
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