NYTimes.com: International Battery, a small start-up in Allentown, Pennsylvania, is developing a battery that is smaller than a cereal box but with nearly the energy of a conventional car battery.This summer the Obama administration announced how it will distribute some $2.4 billion in stimulus grants to companies that make such advanced batteries for hybrid or all-electric vehicles and related components. International Battery is vying for a modest chunk of it.The hope is that the grants will spur far higher levels of experimentation and production, pushing down the costs that have prevented these batteries from entering the mass market.