I have read about the A123systems - Hymotion Prius conversion in
Consumer reports. It looks like just what the doctor ordered.
They have already performed hundreds of conversions.
And the plug-in pack is filled with A123systems Lithium Nanophosphate
batteries.
Check it out at:
http://www.a123systems.com/hymotion/get_charged/where_can_i_get_one