Asus A552EA E-Manual page 20

Battery pack
The battery pack is automatically charged when your Notebook
PC is connected to a power source. When charged, the battery
pack supplies power to your Notebook PC.
Spring battery lock*
The spring battery lock automatically locks the battery pack in
place once it is inserted into the battery slot.
IMPORTANT! This lock should be held in an unlocked position
when removing the battery pack.
Manual battery lock*
The manual battery lock is used to keep the battery pack
secured. This lock should be manually moved to a locked or
unlocked position to insert or remove the battery pack.
* on selected models only
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