Panasonic Toughbook CF-30C3DAZBM Reference Manual page 25

Battery Power
Pull the tab (C) of the battery pack.
C
To insert
Insert the battery pack until it securely fits the connector.
A
Close the cover until it clicks.
B
Slide the latch (D) to the left to lock the cover.
C
CAUTION
Make sure the latch is securely locked, otherwise the battery pack may fall when you carry the computer.
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