in her book, "plug-in hybrids: the cars that will recharge america", published in february 2007, sherry boschert argues that large-format nimh batteries are commercially viable but that cobasys refuses to sell or license them to small companies or individuals. boschert concludes that "it's possible that cobasys (chevron) is squelching all access to large nimh batteries through its control of patent licenses in order to remove a competitor to gasoline. or it's possible that cobasys simply wants the market for itself and is waiting for a major automaker to start producing plug-in hybrids or electric vehicles."