Sony PCG-TR5MP Hardware Manual page 17

Hardware Guide
Inserting the battery pack (VGN-A series)
To insert the battery pack, proceed as follows:
1
Slide the lock lever (1) on the bottom of the computer to the UNLOCK position.
2
Slide the release lever (2) on the bottom of the computer to the RELEASE position.
3 Remove the battery compartment cover.
4
Slide the battery in the battery compartment cover.
5
Insert the tab on the battery into the notch and push the battery down into the compartment until it clicks into place.
6 Slide the lock lever to the LOCK position to secure the battery on the computer.
✍
When the computer is directly connected to AC power and has a battery pack inserted in the battery bay, it uses power from the AC outlet.
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Using your VAIO computer