Mitsubishi LANCER Owner's Manual page 601

Vehicle care and maintenance
2. Turn the plastic nuts (C) counterclockwise, and then
remove the battery upper cover (D).
NOTE
Be careful not to lose the removed plastic nuts.
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To install
1. Install the battery upper cover (A) onto the battery, and
then push the plastic nuts (B) in the direction shown by
the arrows to secure the cover.
NOTE
Be sure to install the plastic nuts in the correct direction.
Make sure that the battery upper cover is installed
securely.
2. To install the air duct, perform the removal steps in
reverse.
CAUTION
!
Be sure to install the battery upper cover. Other-
wise, the battery electrolyte may spill and cause a
malfunction.