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mobile - n. able to move from one place to another
battery - n. a device that is placed inside a machine (such as a clock, toy, or car) to supply it with electricity
update - n. a change or addition to computer software that includes the most recent information
percentage - n. a number or rate that is expressed as a certain number of parts of something divided into 100 parts
scroll - v. o move text or images of a Web page, document, etc., up, down, or to the side on a computer screen so that you can see all of it
function - n. the special purpose or activity for which a thing exists or is used
