Ron,

I cannot fulfill the below requirements, but I can suggest an
AGM battery that should give you about 20 miles of 40 MPH range,
cost less than $900 and weigh about 500 lbs.
Cycle life should be between 300 and 500 cycles, giving between
6000 and 10,000 electric miles.

The UB12500 is a 12V 50Ah (20h) battery that can deliver 50A
for 27 min (150A for 7 min) see
http://www.universalpowergroup.com/specs/D5698.pdf
If this can fit in the Prius, it may be a good datapoint to
test this slightly larger battery type.

Regards,
Cor.

--- In priusplus@yahoogroups.com, Ron Gremban <rgremban@...> wrote:
> 2. In the meantime, I'd like to request that anyone making a
> battery or battery company suggestion check first with the
> company to verify that they have a product that meets the
> following minimum parameters -- or find someone to send your
> suggestion to who will do this initial checkout:
>
> Development stage: in at least limited volume production, with
> specifications available
> Specific energy: >40 Wh/kg
> Power handling: >10C (6 minute full discharge rate)
> Calendar life: >10 years
> Cycle life: >4000 cycles (to 80% depth-of-discharge desired,
> to 50% minimum, may require special control electronics)
> Cell size: 28-50 Amp-hr (6-10 kWh pack at 216V without massive
> paralleling of cells, and weighing <300 lb)
> Cost #1: <$600/kWh in quantities for hundreds of PHEVs