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From: "Ed Anderson" <eanderson@carolina.rr.com>
To: "Rotary motors in aircraft" <flyrotary@lancaironline.net>
References: <list-1815284@logan.com>
Subject: Re: [FlyRotary] Finally built - 3.7 lb, 600 cranking amp, 11.5 A-hr battery
Date: Tue, 6 Feb 2007 12:05:13 -0500
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That is indeed impressive, Bill. Weights about 10 lbs less than the Odyssey 
PC680, equivalent cranking amps, bit more voltage, so a bit better power, 
only 5 A-hr less than Odyssey.  So looks like you could double the weight 
7.4 lbs and have MORE A-Hr and still 1/2 the weight of the Odyssey.

If I were to make a suggestion, it would be to look at the marketing 
advantage of having more A-hr than the Odyssey at 1/2 the weight (If it 
scales that way).  The aircraft market and racers are probably two areas 
that would be interested in that kind of weight savings at that price.  Just 
my 0.02


Ed
----- Original Message ----- 
From: "Bill Dube" <billdube@killacycle.com>
To: "Rotary motors in aircraft" <flyrotary@lancaironline.net>
Sent: Tuesday, February 06, 2007 11:21 AM
Subject: [FlyRotary] Finally built - 3.7 lb, 600 cranking amp, 11.5 A-hr 
battery


> Well, I said I was going to do it and we finally got the prototype built.
>
> We just built a 600 cranking amp, 11.5 A-hr, battery that weighs just 3.7 
> pounds. I've been testing it in my GMC van for the past week here in the 
> Denver Winter. It snaps the van right over every morning without a 
> problem. The van cranks faster than it did with the standard lead-acid 
> battery.
>
> It is smaller than the Odyssey 680 so it fit in the same battery box with 
> a couple of foam blocks for spacers.
> The battery has four status LEDs that tell you the cell balancing 
> electronics are working OK. We are using A123 Systems M1 cells with our 
> own custom battery management electronics. The A123 Systems cells are 
> proven to be the safest Li-Ion cells on the market. No problems with fires 
> (like laptop cells) because the chemistry they use is completely 
> different.
>
> The battery can be damaged by running it completely flat (like leaving the 
> master on) and holding the battery below 8 volts for a long time. It can 
> also be damaged by charging it over 15.0 volts. It will likely still 
> function after such abuse, but it won't be nearly as good as it was 
> originally. If you don't abuse it, it should last you for many years.
>
> I think we will be in production in about a month, maybe two.
>
> Specs:
>
> 3.7 lbs
> 600 cranking amps
> 11.5 amp-hr
> Approximate maximum dimensions: 3" wide, 5" long, 7" tall (including 
> terminals)
> Charging voltage = 13.8 to 15.0 volts (anywhere in this range is OK)
> Nominal voltage = 13.2 volts (Just a touch higher than your typical 
> lead-acid, so it spins the starter a touch faster.)
> Cell cycle life rated at 2000 cycles (80% DOD, 90% capacity remaining) 
> 10,000 cycles (80% DOD with 50% capacity remaining) @25 C
> Cell specs: 
> <http://www.a123systems.com/html/products/ANR26650M1specs.pdf>http://www.a123systems.com/html/products/ANR26650M1specs.pdf
> Maintenance free
> No heavy metals (iron-phosphate type cells)
>
> At this time, we estimate the retail price will be $595. (Yeah, I know 
> this is not cheap, but this is the state-of-the-art battery technology so 
> the parts to make it are not cheap.)
>
> Here is a picture of the prototype. We have it in a clear Lexan case so we 
> can keep an eye on it. The production battery will have a smaller opaque 
> case with a clear top lid (terminal end.)
> http://www.killacycle.com/photos/aircraft-battery/Prototype1InVan.JPG
>
>
> We have been racing these cells in the KillaCycle for about a year, so we 
> know _all_ about them.
> <http://www.KillaCycle.com>http://www.KillaCycle.com (Be sure to watch the 
> movie clip.)
>
>
> Bill Dube'
> <mailto:bike@KillaCycle.com>bike@KillaCycle.com
>
>
>
> --
> Homepage:  http://www.flyrotary.com/
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