NEW YORK: Dell Inc, the second-largest personal-computer maker, introduced business laptops that can run for as long as 19 hours on a single charge.Dell's Latitude E6400, which comes with a 14.1-inch (35.8 centimeter) screen, has a life of 8 hours and can run longer with an extra battery that slides onto the bottom, said Margaret Franco, head of business notebooks. That version costs $1,139, while a model with a 15.4-inch screen sells for $1,169.Chief Executive Officer Michael Dell returned last year to spark a recovery after the company lost the lead in the PC market to Hewlett-Packard Co. While targeting consumers by selling computers through retail stores, Dell is trying to appeal to businesses with new designs and colour options.���Dell sold reasonably priced workhorse models, but they were stodgy,'' said Leslie Fiering, an analyst at Gartner Inc in San Jose, California. The new models represent a ���major industrial design change.���About 82 per cent of Dell's $16.1 billion in sales last quarter came from business customers, with consumers accounting for the rest. Corporate sales increased 6.9 per cent, compared with a 21 per cent gain in the consumer business.Dell's other new business laptops include the ultra-portable Latitude E4200. It weighs 2.2 pounds (1 kilogram), making it the lightest laptop Dell has made. The computer has a 4-hour battery life and a 12.1-inch screen.