1. A method of displaying battery condition information on a display of a portable computer, the method comprising: powering on the portable computer; detecting whether an existing battery of the portable computer has been replaced with a battery that is different than the existing battery; retrieving battery condition information of the replaced battery when the existing battery is detected to have been replaced, the battery condition information comprising a current charge of the battery; displaying the retrieved battery condition information on the display of the portable computer; and executing an operating system (OS) loaded into an executable memory of the portable computer once an indication to proceed has been received.