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Re: [EVDL] Press release on Firefly "Oasis" battery

The actual cycle life will not be known until the batteries become availabl=
e, or are tested by an independent lab, but they do show theoretical cycle =
life to failure relative to other battery types on page 13 of their technic=
al white paper.

> Date: Fri, 2 Nov 2007 09:35:11 -0400> From: [email protected]> To: [email protected]=> Subject: Re: [EVDL] Press release on Firefly "Oasis" battery>=
> Jeff Shanab wrote:> > >>Then lets throw in the cycle life difference and=
I think it becomes> obvious.<<> > Hello Jeff,> > From an article written b=
y Noel Adams in Electrifying Times > (
fly_energy.html), where Noel is > interviewing Mil Ovan, Senior VP Firefly =
Energy, Noel writes:> > "The people at Firefly Battery think that they can =
change this. They > have developed a battery using lead acid chemistry that=
significantly > increases the power density while improving cycle life. Le=
ad acid > battery chemistry is theoretically capable of delivering 216.8 Wh=
r/Kg > while current technology averages 30 Whr/Kg.... I haven=92t been abl=
e to > tie Mil down to a figure on energy density but he expects it to be t=
wo > to three times the current energy density of current lead acid > batte=
ries. This would put them close to NiMH at 70 whr/kg but lower than > Lithi=
um at 120 whr/kg." Two to three times is great. That will allow me > to use=
my EV as a long range commuter.> > He goes on further to write: " I asked =
Mil about the cycle life of these > batteries. He told me =93cycle testing =
is still in progress so we don=92t > have a definitive answer right now. It=
takes a long time since there are > only so many charge discharge cycles y=
ou can do in a day. We were > expecting these batteries to perform slightly=
short of NiMH and Lithium > batteries but so far we are doing better than =
expected, tracking very > closely to the cycle life of NiMH=94."> > While n=
o interview date was published on the Electrifying Times page, he > is talk=
ing about the FY2006 Defense Bill. This means an interview in the > 2005-20=
06 time frame. I was wondering where you were getting your cycle > life num=
bers for the Firefly's? I could not find anything so far using > Google and=
there is very sparse technical data on the Firefly site; just > enough to =
whet the battery appetite.> > The Oasis battery advertisement page from Fir=
efly says 2x greater cycle > life and references 200 cycles as the start of=
a drop off point for the > Fireflys. But does that mean that if I can get =
1,000 cycles out of my > Optimas, does that mean I will be able to get 2,00=
0 cycles out of a set > of Fireflys'?> > Peter> > _________________________=
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