Laptops were originally marketed as "business" machines, capable of using spreadsheet, presentation, and financial software packages, just as desktops could. Notebooks were mainly marketed for "personal" tasks, such as email, writing, entertainment, and file management. The biggest difference between the two eventually became the size and weight of the battery, with laptops boasting 2-3 times the battery life of notebooks, but also weighing 3-5 pounds more.