Section 12 (Starting/Charging Systems (H4SO)): Battery: Removal
WARNING: This page is about a different car, the 2006 Subaru Outback and 2006 Subaru Legacy. However, it is still accessible from the selected car via links, so may be relevant.
Disconnect the positive (+) terminal after disconnecting the negative (-) terminal of battery.
Remove the flange nut from battery rod and remove battery holder.