Facebook Testing Lithium-Ion Batteries For Backup Power 41
itwbennett writes Facebook has just started testing lithium-ion batteries as the backup power source for its server racks and plans to roll them out widely next year. Lithium-ion has been too expensive until now, says Matt Corddry, Facebook's director of hardware engineering, but its use in electric cars has changed the economics. It's now more cost effective than the bulky, lead-acid batteries widely used in data centers today.
