"after Battery Update has been installed, each battery you insert into your MacBook or MacBook Pro will be updated automatically. Your computer's power cord must be connected and plugged into a working power source."
you can never again use the laptop unless the cord is plugged?
sorry im dunb wheb it comes to computers, how do i get the battery working on its own. it has an x in the battery icon. ive downloaded all that apple support has asked for. does that mean theres no hope for my battery. i just perchased a new one today and still nothing.