Removal Procedure
WARNING: This page is about a different car, the 2012 Buick Verano. However, it is still accessible from the selected car via links, so may be relevant.
Courtesy of GENERAL MOTORS COMPANY
NOTE:
Mind the 3 battery cover retainer clips (arrows). The battery cover could be damaged if the retainer clips are not fully unlocked.
Remove the battery cover (1) from the battery tray.