California EPRI Legal Nickel Metal Hydride 
Tony Karrer Delicious EVdriven
APRIL 21, 2009
As for warranties , there is legal precedent that original auto warranties cannot be voided completely by modifications — only the part(s) affected by retrofit will have their warranties affected. We will have similar solutions available for better (but more expensive) nickel-metal hydride or lithium-ion batteries.)
Tony Karrer Delicious EVdriven
APRIL 21, 2009
Despite this, a 2003 EPRI study , assuming only $2/gallon gas , zero buying incentives, and a PHEV premium of $3-$5,000 more than standard hybrids, shows that the total lifetime cost of ownership for a PHEV will be lower than that of any other vehicle type -- so the payback will be there. The EPRI says lithium-ion batteries are ready now.
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