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Discussion Starter #1
> > ...but the specs don't show any welding tabs, so you'd have to add on
> > the price of creating connections, too. You can find Dewalt packs near
> > $100, and those 10 A123 cells will all have tabs (just not the kind
> > used in the Killacycle).
> >
>
> Yeah, but that costs twice as much per cell, at roughly the same
> capacity. I don't think it's worthwhile to pay an extra $5/cell for
> tabs. (I know you also get the plastic case and BMS, but I still don't
> think it's worth the price increase.)

Ignoring the case or BMS, it's $10/cell purchasing as few as 10 cells
(i.e. 1 pack) on eBay - less if you can buy them at wholesale as a
retailer. At least we've seen that A123 cells are obtainable and high
quality; Valance, ThunderSky, Cobasys are all have unknowns in one way
or another...so, who's going to put their money where their mouth is?
Not me - not enough money, ability, or obsession, and SLAs are doing
all I need for now!

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70 Posts
Discussion Starter #3
Ian Hooper wrote:
> I haven't given up hope on building packs from commodity 18650/26650
> LiFePO4s though, since some brands aren't too far off TS pricing and
> there are advantages to using them (e.g higher power).

Has anyone done any real testing with these commodity 18650 or 26650
cells? The specs are great -- if you can buy new, high-quality cells.
But these only get sold to big OEMs.

Most of what's being sold to "mere mortals" off the internet are
junk-grade; rejects, old stock, cells from sleazy companies, etc. I've
tried a few to rebuild laptop battery packs, and mostly gotten poor
quality parts. They're OK if you only need a small number, for a non
critical application, and don't mind hand sorting and testing them.

But if you're going to make a large pack with small cells, it is *vital*
to get high quality, highly consistent, brand new cells!
--
Ring the bells that still can ring
Forget the perfect offering
There is a crack in everything
That's how the light gets in -- Leonard Cohen
--
Lee A. Hart, 814 8th Ave N, Sartell MN 56377, leeahart_at_earthlink.net

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Discussion Starter #4
Has anyone had any experience with the lionEV lithium phosphate or litium p=
olymer batteries?
Beano -- 1981 Ford Escort EV =

EValbum 1010Ted Sanders

> Date: Wed, 12 Sep 2007 11:39:42 -0500> From: [email protected]> To: =
[email protected]> Subject: Re: [EVDL] Dewalt batteries> > Ian Hooper wrote=
:> > I haven't given up hope on building packs from commodity 18650/26650 >=
> LiFePO4s though, since some brands aren't too far off TS pricing and > >=
there are advantages to using them (e.g higher power).> > Has anyone done =
any real testing with these commodity 18650 or 26650 > cells? The specs are=
great -- if you can buy new, high-quality cells. > But these only get sold=
to big OEMs.> > Most of what's being sold to "mere mortals" off the intern=
et are > junk-grade; rejects, old stock, cells from sleazy companies, etc. =
I've > tried a few to rebuild laptop battery packs, and mostly gotten poor =
> quality parts. They're OK if you only need a small number, for a non > cr=
itical application, and don't mind hand sorting and testing them.> > But if=
you're going to make a large pack with small cells, it is *vital* > to get=
high quality, highly consistent, brand new cells!> -- > Ring the bells tha=
t still can ring> Forget the perfect offering> There is a crack in everythi=
ng> That's how the light gets in -- Leonard Cohen> --> Lee A. Hart, 814 8th=
Ave N, Sartell MN 56377, leeahart_at_earthlink.net> > ____________________=
___________________________> For subscription options, see> http://lists.sj=
su.edu/mailman/listinfo/ev
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Gear up for Halo=AE 3 with free downloads and an exclusive offer. It=92s ou=
r way of saying thanks for using Windows Live=99.
http://gethalo3gear.com?ocid=3DSeptemberWLHalo3_WLHMTxt_2
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Discussion Starter #5
I've been told that the large scale manufacturers have representatives
in China who see to it that production follows the manufacturer's
instructions and meets their specifications. The "leaded" Barbies are
the result of a Mattel slip up of not hiring or making sure that they
had hired such a representative. Otherwise you "pays your money and
takes your chances". QC is worth a lot.


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