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  1. xyster

    Highly Enlightening Presentation 4 The Entrepreneur

    Well worth the time to click through the slides: http://www.slideshare.net/rolfsky/web20-why-we-got-here-and-whats-next/
  2. xyster

    Eric's Project #002

    I really have no need to charge that fast. My present system fits my needs more than adequately. So it's just not worth the time or money to me to rebuild my pack to charge from that. Sounds like it could work well for you though, Beagle. :-) Do you have 220v large appliance outlets in your house?
  3. xyster

    The "Infamous" Cost Comparison Thread

    I'm at about 300 partial discharge/recharge cycles. With 2500wh on tap and an average daily ride of 10-20 miles, I don't need to use more than 20-30% of my pack's capacity. I can't tell any difference in range yet. Before I built this pack, I calculated from info at batteryuniversity et al that...
  4. xyster

    -- THE SINGLE CELL CHARGER POST --

    Yes. The cells are only good for a continuous 1C. Trying to suck 35 amps from a single 2.2ah cell would not be advisable :) ; from 12 is doable, from 15 makes a fine pack that only sags 6 volts out of 80 volts under full, 35 amp load.
  5. xyster

    -- THE SINGLE CELL CHARGER POST --

    The one time I ran my pack down all the way during testing, it took 30 hours to recharge. I think that 12 hours was probably referring to recharging overnight between ~20% and 80% capacity. Normally, I use 20-30% of my pack's capacity to ride 20 miles, running the cells down to ~3.85 volts from...
  6. xyster

    Eric's Project #002

    That's a very interesting series/parallel switching system idea, but I don't see how it disengages the series wiring when it engages the parallel wiring (which I do see). Can you expand on this, Beagle?
  7. xyster

    New ebike auction site

    Interesting.... Specialized auction sites seem a great idea that should become more popular as the granddaddy, ebay, becomes ever more of an unwieldy pit of scum, villainy, and stolen merchandise. At specialized sites, positive reputation gained from online forums like this one carries over...
  8. xyster

    -- THE SINGLE CELL CHARGER POST --

    OK. Here's my 20 single-cell chargers from batteryspace: http://www.batteryspace.com/index.asp?PageAction=VIEWPROD&ProdID=1231 charging my 20s15p pack of lithium 18650s from all-battery: As most of us know, for lithium, single cell chargers automatically rebalance every cell in the pack with...
  9. xyster

    The "Infamous" Cost Comparison Thread

    Nice comparison, Safe. Now, add to your last sheet the total cell weight for each type pack....
  10. xyster

    What is the best offroad climber kit?

    How important is bike weight to you? What's your budget? Do you just want some assistance getting up these hills, or do you want a light motorcycle level of power? A system better suited for your more specialized needs can be obtained by buying the parts individually, rather than as a kit. As...
  11. xyster

    9C-12C NiMh Battery NEW!!!

    Then in order to use ~4ah NiMH cells, you have to run separate strings in parallel. Your overarching argument is that a small NiMH pack can be built cheaper than a pack of 18650s because fewer cells are required. Three strings of 30 cells (36v) is 90 cells. 90 NiMH cells at ~$3 each is no less...
  12. xyster

    Twins!

    That's my experience with 10 gauge too. I'd rather double-up on the 12 gauge if necessary.
  13. xyster

    Pumas to Have Metal Gears on High Power

    Thanks for the info, Knoxie. This is good news for those of us who love the X5's performance, but not its weight. Since you've used the metal gears, do you know how much weight metal gears add to the motor over nylon gears?
  14. xyster

    9C-12C NiMh Battery NEW!!!

    I'm talking about the plethora of reviews of NiMH subC's at rcgroups.com describing cycle life on an order of 10% the spec when drained near the cell's drainrate spec.
  15. xyster

    9C-12C NiMh Battery NEW!!!

    Great! Last I heard Justin had given up on NiMH because of the high failure rate. Apparently he believes these new cells will be more reliable. Got me. :) I noticed he's also selling raw, 5C NiCd cells: bottom of the page http://www.ebikes.ca/store/ Why not try those instead of the already...
  16. xyster

    9C-12C NiMh Battery NEW!!!

    The 36v 30amp li-ion pack can be built with 100 cells (10s10p), cheap single cell chargers, and no BMS for about $500. NiMH, as you know because you were involved in the threads too, requires cell-matching as they roll off the assembly line with a high degree of variability, and each cell has a...
  17. xyster

    9C-12C NiMh Battery NEW!!!

    I find your argument rather academic, Safe, because better lithium cells are no more expensive. I could buy an old, beater Chevy for $2000 and ask how I might fix it up so that it runs reliably. Or I could buy an old, beater Honda for $2000 that already reliably performs adequately. Unless I...
  18. xyster

    testing made easy

    Wouldn't it be great if after exercising the motor it grew stronger? :D
  19. xyster

    Has Anyone Seen Brown Emolis?

    If these cells only charge to 4.06v, either they ain't unadulterated LiMn, or they are somehow damaged. Beagle, any chance these problem cells are also the ones you reported shorting? If these cell's capacity is the same 2.6ah under load, and they can supply the amps, then they could still be...
  20. xyster

    Has Anyone Seen Brown Emolis?

    They are known to come in those two colors: http://www.rcgroups.com/forums/showthread.php?t=529722 I couldn't quickly find any other difference between the colors, but seem to recall someone at rcgroups.com reporting that one has a steel end cap, and the other an aluminum end cap. Perhaps you...
  21. xyster

    9C-12C NiMh Battery NEW!!!

    From what I know of both, I'd choose lithium 18650s hands down...as I did. Being able to parallel lithium (like lead) for charge and discharge is a huge advantage in practice.
  22. xyster

    Red Hornet??

    Ypedal said 140mm without brake OR freewheel! Can you stretch your dropouts that far without critically weakening the rear triangle's ability to hold such a powerful motor?
  23. xyster

    Red Hornet??

    Too bad. That makes it an impractical replacement for an X5 in most ebikes with standard 135mm dropouts.
  24. xyster

    9C-12C NiMh Battery NEW!!!

    A different form factor, but the specs are on par with sub-C NiMH that have been available for some years now: http://www.all-battery.com/index.asp?PageAction=VIEWPROD&ProdID=1827 The folks at rcgroups.com report that the cycle life of high rate NiMH is notoriously poor when actually operated...
  25. xyster

    Fuel cells yet?

    The larger, ~30lb methanol fuel cells can put out sufficient amps to run an ebike, but they are better suited for the task in tandem with chemical batteries or superduperultramegawickedcapacitors. Still quite expensive too...
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