| 摘要 |
PURPOSE: A structure for connecting a secondary battery of a mobile computer system is provided to combine the secondary battery to an exterior of the first battery directly without a special operation of a system being used and the secondary bay module. CONSTITUTION: An SM bus host(10) checks a charging state of the first battery(battery 'A', 50) at an interval of a predetermined time. If a predetermined voltage for operating a system is not charged, a battery is replaced through a battery selection unit(20). The battery selection unit(20) switches the first battery and the secondary battery using a hardware switch(40) or a software. The battery selection unit(20) may be constituted using a micro computer. The battery selection unit(20) is switched and charged for connecting an almost discharged battery 'A'(50) to a battery charging unit(30). When the battery 'A'(50) is almost discharged, a battery 'B' being combined to the exterior is switched for being used as a power source.
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