At the SAE Hybrid Vehicle Technology Symposium in San Diego this week, Nissan's Toshio Hirota revealed the test program that they have been running. One of the twenty cars has run over 150,000 miles. According to Toshio, they are evaluating many different chemistries, but the test program has been running with cells that use a manganese spinel anode. That's the same type being supplied by LG Chem for the Chevy Volt development program. The packs have so far proven to be very efficient and provide more consistent power than NiMH packs.