BRIEF DESCRIPTION OF THE DRAWINGS
In order that the advantages of the invention will be readily understood, a more particular description of the invention briefly described above will be rendered by reference to specific embodiments that are illustrated in the appended drawings. Understanding that these drawings depict only typical embodiments of the invention and are not therefore to be considered to be limiting of its scope, the invention will be described and explained with additional specificity and detail through the use of the accompanying drawings, in which:
FIG. 1 shows a configuration of a charging system to which an embodiment of the present invention is applied;
FIG. 2 shows a state in which a battery pack to which the present embodiment is applied is attached to a laptop PC;
FIG. 3 shows a state in which the battery pack to which the present embodiment is applied is attached to an external battery charger;
FIG. 4 shows a method for determining and controlling a charging voltage value and charging current value of an external battery charger to which the present embodiment is applied;
FIG. 5 is a flowchart showing operation of a program executed by an MPU in a battery pack to which the embodiment is applied;
FIG. 6 shows a charging voltage and a charging current during charging of a battery pack to which the present embodiment is applied;
FIG. 7 shows a configuration of a conventional charging system;
FIG. 8 shows a conventional battery pack attached to a laptop PC; and
FIG. 9 shows the conventional battery pack attached to an external battery charger.