WARNING: This page is about a different car, the 2013 Subaru Forester. However, it is still accessible from the selected car via links, so may be relevant.
Hydrometer indicator
State of charge
Corrective action
Green dot
65% or more
Load test
Dark dot
65% or less
Charge battery
Clear dot
Low electrolyte
Replace the battery.(1) (If cranking is difficult)