| 摘要 |
The present invention provides a battery unit that is detachably attached to such an electronic apparatus as a notebook computer and maximizes the space efficiency with an expansion unit in the electronic apparatus. The battery unit includes a battery-unit extending portion that perpendicularly overlaps a relatively thinner portion of the expansion unit that is also detachably attached to the electronic apparatus and realizes a predetermined function when the expansion unit is connected to the electronic apparatus. The overlapped thinner portion and the battery-unit extending portion maximize efficiently the space in the electronic apparatus.
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