Good source for Lithium-Ion Batteries?

Question

What would be a cost-efficient source for batteries that could *assist vehicles. I'm toying with ideas for retrofitting power-assist/ add-ons to gas-only vehicles for increased MPG. Lithium-Ion has made its way to cordless tools and can be purchased for about $120 per h.p. or probably more like 1/2 h.p for sustained output (i.e., Dewalt 36 Volt = "750 watts" fully charged) The idea is probably for power-assist during acceleration only. What battery qualities should I look for?

In case someone wants to flame me for thinking out loud, that's fine, but crunch some numbers and show me why this is wont work.

Thanks in advance.

Answer 1

You should look at Lithium Nanophosphate (LiFePO4), which by the way, are the cells used in the DeWalt 36v battery packs.

<>http://en.wikipedia.org/wiki/Lithium_iro...

The very high power discharge capabilities of these cells makes them very attractive. Combined with very safe operation, high cycle life and good energy density and they top the current field for mobile operations.

Lithium Nickel Cobalt Manganese Oxide Li(NiCoMn)O2 is also a contender but is not as safe as Lithium nanophosphate.

Check out this site for information:

<>http://www.a123racing.com/>

Answer 2

Tesla Motors is using the cell used in laptops. It is a 18650 or equivalent.