so i have an older (not ancient) ibook. dual usb 500 w/ dvd and i hadnt used it in a while. i had left it plugged in for probably a month but shut down and when i went to turn it on i got an x battery icon. i pulled the battery out and put it back in and now it just says calculating and never says how long it will take before it is charged. is there anything i can do to get this battery up and running again?