On 10 Jan 2007 12:59:43 -0800, "JD" wrote in
.com:

Check out the batteries from A123 Systems:
http://www.a123systems.com/html/technology.html

Li Ion batteries made with iron at 1/5 the price, twice the power and
half the weight of conventional Li Ions.
They are already on the market and are starting to show up in
DeWalt's/Bosch 36V cordless tools.
They have a weight to Watt ratio less than 1 lb / 1500W ( .9 to be
exact).

http://www.a123systems.com/html/_cha.../techComp.html

Parameter A123 Ml LiIon
----------------------------------------------------------------
Power Density 3,000 W/Kg 1,350 W/Kg

Weight to discharge @ 1,500W 0.9 lbs 2.75 lbs

Life at 100% DoD 1,000 500

So what's the downside to this cell for aviation applications?

Scheeesch if their stock ever goes public, I'll be standing in long
line of buyers.

If this is true:

http://www.a123systems.com/html/tech/power.html
A123Systems M1 cells offer the highest commercially available
power density of any Li Ion chemistry: Our high power products are
able to pulse at discharge rates as high as 100C and deliver over
3000W/kg, over an order of magnitude better than conventional
Lithium-Ion cells and with their low impedance and thermally
conductive design, A123 cells can be continuously discharged to
100% depth of discharge at 35C rate, a marked improvement over all
other rechargeable battery alternatives.

I share your enthusiasm.