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  1. oofnik

    Headway cell temperature

    I have my 12 cell Headway pack in a sealed box with very little heat transfer ability. I pulled 9.5 AH in about an hour on a hard test run the other day. The cells got up to about 130 F; kind of uncomfortable to touch. Even though LiFePO4 is very stable I'm thinking this is too high and not very...
  2. oofnik

    Hall effect throttle to 5k pot?

    I have a Turnigy servo driver that I'm planning to use on my R/C e-bike. Inside is a 5k pot that adjusts the servo signal output duty cycle. I measured the wiper voltage to vary between .42 and 4.56V. If I desolder the pot from the servo driver and wire in a hall effect twist grip throttle, does...
  3. oofnik

    CC HV current limiting for free?

    If you don't already have one to go along with your Castle Creations ESC, the Castle Link USB programmer is an excellent tool. It allows you to update the software on your ESC and super-fine tune all your settings like motor timing, throttle response, low voltage cutoff options, etc...
  4. oofnik

    Headway BMS?

    Hi everyone, I'm looking for details about the new (?) BMS being supplied with the Headway packs. I'm still considering Gary's circuit and am looking for some sort of comparison of the benefits and drawbacks between each design. If anyone has any detailed information on the functionality of the...
  5. oofnik

    Simple single cell low voltage indicator

    I want to build a circuit that will monitor the voltage of all 12 cells in my pack and tell me to stop when any one of them drops below the cutoff. Here's what I had in mind. Each cell will be connected to an independent comparator's inverting input using the balance plugs. A 12V regulator will...
  6. oofnik

    Kayo Battery?

    Another Chinese cell manufacturer, Kayo Battery. They look quite good. It appears their website popped up overnight? :shock: Anybody seen these before or have any more information?
  7. oofnik

    High power LiFePO4 battery

    Your specifications are contradictory on a few of your products. 30 mOhm cells are also not considered "high power". I would suggest you back up your claims on your product's quality with some independent testing before people here will buy from you.
  8. oofnik

    Standardizing the measurement of internal resistance

    As I understand it, the internal resistance of a battery is the single defining characteristic of its discharge capability. I hope I am correct in assuming that internal resistance can (a) be regarded as constant with respect to discharge current, and (b) generally increases gradually as time...
  9. oofnik

    Another Chinese LiFePO4 manufacturer: Ieehoo

    They have some listings on ebay for 20AH lifepo4 packs. The cells look like Yesa cells but they're all white. Claiming 3C discharge rate on their company website. Anybody have any more information? Just trying to seek out the competition here.
  10. oofnik

    Mongoose DX project

    Hi everyone, I've been watching the giant RC motor thread with great interest over time. First off I must say that I'm all for making a forum division for this kind of stuff! Excellent idea. Anyway I had the idea of using RC brushless motors for my e-bike project quite a while ago when the idea...
  11. oofnik

    Will this motor work?

    Hi guys, I got this brushless DC motor for peanuts from an industrial surplus place knowing little about it, and I want to know if I can make it work for an e-bike. I found the datasheet for it which lists mechanical specifications, but the particular winding designation used in this motor is...
  12. oofnik

    Merging the R/C crowd with EVers

    Hi everyone, I'm researching to build my first e-bike out of a Mongoose DX 3.3. I see a lot of people using relatively archaic e-bike parts for lots and lots of $$$. I'm a mechanical engineering student with little money and lots of faith in new technology :D and I think we can do better in...
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