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  1. webfootguy

    A123 20AH cells source?

    I would add http://a123rc.com/ as selling A123 20Ah cells as well (but I don't know their source). The pictures show "made in Korea". Phil H.
  2. webfootguy

    am i correct in calculating this amount of surface ?

    The M1 cells are "hard" to solder to directly. You need high heat and high thermal mass to heat the end quickly and solder the tab to it. If you heat it more than a few seconds, the insides of the cell get too hot (some of the internals are plastic) and they melt damaging the cell. The damage...
  3. webfootguy

    Most cost effective, timely method of matching 350 M1 cells.

    Here is what I would do: 1) charge all cells to 3.65 until current drops to C/20. You can do this cell by cell or in a big parallel group if you have good temporary connetions. Let cells rest for 24 hours. Measure voltage again. Good cells will still be 3.45 to 3.5 while marginal cells will...
  4. webfootguy

    Purchasing from ShenZhen Victpower Technology

    The reality is that A123Systems has about 5 months of cash on hand (go read their shareholder reports). If they do not find more financing or reduce costs (layoffs, drop products,etc.) or suddenly sign a big contract with up front $$, they will probably go Chapter 11 in 6 to 12 months. This...
  5. webfootguy

    DIY Aptera knockoff?

    I have a Twike designed in the mid 90's. It weights 520lbs with 112lbs of battery (and no driver or passengers). It is made from aircraft aluminum and plastic. Not as fancy as the Aptera but highly efficient for a commuter vehicle. I have some pictures that were taken at the factory in...
  6. webfootguy

    BVM-8s - new 1-8 cells battery monitor device?

    Has anyone seen or used this new battery monitor device called the BVM-8s? It showed up on ebay this week. http://www.ebay.com/itm/200682907061
  7. webfootguy

    A123 20Ah Prismatic cells AMP20M1HD-A on Ebay

    I just noticed that someone is selling 50 of the A123 20Ah pouch cells on ebay (with full tabs). Price is a very reasonable $34.75 plus shipping (expensive shipping unless you buy lots). They are listing them as NEW but in the picture I would have my doubts as the cell looks like it has had at...
  8. webfootguy

    Revenge of the electric car

    Thanks to those that attended and took the opportunity to support EV's and meet Chris Paine. It was cold and wet outside but warm and friendly inside.
  9. webfootguy

    Accurate affordable RI meter for low impedance cells?

    Looking forward to your analysis of how it did ;-)
  10. webfootguy

    Revenge of the electric car

    Just a quick note to folks local to Portland, Oregon area. The movie "Revenge of the Electric Car" that is a follow on to "Who killed the Electric Car" will be shown starting Friday, 11/4/2011 at 7pm and 7:30pm at the Hollywood Theater. There is a EV Road rally scheduled just prior to the...
  11. webfootguy

    Accurate affordable RI meter for low impedance cells?

    The way I read the specs, the lowest scale is 0 ~ 199.9 mOhm and each digit of the scale is 0.1 mOhm which should be plenty of resolution for any cell under 1 mOhm. I'm not confusing accuracy with resolution here (I have no idea how accurate it is but it appears to have the resolution needed)...
  12. webfootguy

    Rectified mains charge lead

    Hey, I charge at 425 Volts every day off a 120 volt mains on my TWIKE. It was designed for 240v mains from Europe and was converted to 120v by using a 1-2 step up transformer (internally mounted) but with a bit of work, I can put in a J1772 and charge faster off the free chargers going up all...
  13. webfootguy

    Twike Velomobile

    I bought mine already converted to US standards and with a VIN number. The VIN number is critical to getting a legal Title and plates from DMV and *insurance* (required in most states to legally drive on the roads). In Oregon it is registered as a motorcycle so Insurance is cheap. I toyed...
  14. webfootguy

    Twike Velomobile

    I have one and I rebuilt my battery packs. Because the charger and controller are integrated and proprietory, homemade lithium solutions are a challenge. Factory lithium solution is available but about 10k.
  15. webfootguy

    A123rc.com... safe to buy from?

    I bought a couple of 20 Ah A123 pouch cells, some M1 cells, and some 18650 cells to test. All arrived as described and since they take paypal, I felt protected from fraud. Ok in my book.
  16. webfootguy

    "Zephyr" - Finally, the "v4" Fechter/Goodrum/Hecker BMS...

    Gary, if you end up not being able to recover your web site, you might be able to get some things back using archive.org or the google cache. Good luck.
  17. webfootguy

    A123 20AH cells source?

    The only place I have seen anything official looking is here: http://mavizen.com/A123.html Specifications: 20 Ah Cell Specification: -------------------------------------- Normal Voltage: 3.3V Capacity (1C to Vmin=2.0V): minimum 18.5AH, typical 20Ah Whr/Cell: 64.6 Dimensions(mm):7.2 x 161 x...
  18. webfootguy

    A123 20AH cells source?

    The 0.5 milliohm implied in the picture is probably wrong at worse and misleading at best. A123Systems themselves spec these cells as <2.0 milliohm and the testing I have done puts the cells I got between 1.5 and 2.0 which on spec as far as I can tell (i.e. you will get some loss to heat at...
  19. webfootguy

    A123 20AH cells source?

    More and more of these cells are starting to show up online. For example: http://cgi.ebay.com/ebaymotors/Original-A123-20AH-Prismatic-Pouch-Electric-Car-Lifepo4-/180675526314?hash=item2a1119beaa#ht_676wt_1165
  20. webfootguy

    Substituting Nimh for NiCD

    I agree you can sub in NiMh for NiCD in this application. I wanted to add that I have had great luck with the new low self discharge cells from HobbyKing. Great price and great capacity. http://www.hobbyking.com/hobbyking/store/uh_viewItem.asp?idProduct=10456
  21. webfootguy

    A123 20AH cells source?

    I'll have to agree with the rant. If nothing else, we need to fix access to quality cells at a reasonable price.
  22. webfootguy

    Portland, OR: Meet and Greet...

    I can bring it by (and this time I can drive it there rather than trailer it :-) ). Do you have a schedule for the weekend? What day should I pick (Sat or Sun?) Phil
  23. webfootguy

    Portland, OR: Meet and Greet...

    As of last week, my Twike is back on the road with new battery cells and more range than it has ever had (boosted cell capacity by >30%). I'm waiting for a firmware update to get the on-board computer to register the full range but I should be able to get 35 or 40 miles of range with a single...
  24. webfootguy

    A123 20AH cells source?

    An auction for 8 20 Ah cells just showed up on ebay. Seller has zero feedback and is based in China. The cells have the tabs cut off but so far the price is right if someone wants to try to get some cells cheap. http://cgi.ebay.com/8-Nanophosphate-AMP20M1HD-A-/250817838393
  25. webfootguy

    A123 20AH cells source?

    I bought 2 cells for $40.99 each (with free shipping) at a123rc.com. Price has since gone up to $59.99 each. My cells appear to have come from the new plant in Michigan as they have "Made in the USA" printed on them and appear new (no marks on the tabs or on the cells).
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