Consumers are becoming ever more dependent on their energy-hungry gadgets. But smartphones, laptops, digital music players, and portable video game consoles tend to gobble up more power with every additional feature. Battery makers are racing to keep up, finding <A HREF="http://news.yahoo.com/s/ap/20051016/ap_on_hi_te/boosting_batteries">new ways to pack more power</A> into smaller and smaller spaces. The technical challenges are daunting. Finding ways of squeezing more performance from available power is a huge area of exploration for electronics makers.