Toshiba TECRA A8 User Manual page 112

To install a battery pack, follow the steps below.
Do not touch the battery release latch while holding the computer. Or you
may get injured by the dropped battery pack by unintentional release of the
battery release latch.
9. Attach the battery cover to the battery pack.
10. Insert the battery pack into the battery pack slot and lock it.
11. Make sure that the battery pack is securely in place and the battery lock
is in the lock position (
12. Turn your computer over.
User's Manual
Battery pack
Separating the battery pack and battery cover
Battery lock
Securing the battery pack
).
Power and Power-Up Modes
Battery cover
Battery latches
Battery pack
6-11