Hewlett-Packard will begin selling on Monday laptop batteries that are guaranteed to last three years. The batteries use Sonata cells from Boston Power, a startup battery maker that has developed a Lithium Ion battery that can last for a thousand charging cycles without degrading. Further, the Sonata batteries will charge to 80 percent of their capacity in 30 minutes, which is faster than most other lithium ion batteries. The batteries will cost US$150, which is about $20 more expensive than most of the replacement batteries currently listed by HP. The deal with HP to sell the new batteries represents the first validation of Boston Power's technology from a major laptop vendor.