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The article focuses on a study concerning a notebook battery that includes an internal charger. It mentions that accessory notebook batteries can be charged via their connection to the notebook computer or through a stand alone charger. The notebook battery in the study features a direct current (DC) input power port that can be connected to a standard alternating current (AC) adapter. Under such scheme, the need for a notebook computer or a battery charger to charge batteries is eliminated.

The article describes an alternative keyboard system for a sub-notebook personal computer (PC). The system allows the small keyboard of a sub-notebook PC to be equipped with a larger keyboard. It comprises of a mechanism that supports the insertion and removal of manually-operated transverse sliding keyboards to enable a larger desktop keyboard to be connected to a sub-notebook PC. It is noted that the system offers ergonomic advantages.