The OEM battery in my 2007 Civic has a hydrometer "eye" in it that's presumably supposed to tell you when the battery is going bad. Normally it's green. When checking stuff out under the hood this morning I noticed that it's not green anymore.
IIRC the manufacturing date for the car was sometime in November of 2006 or so, making the car (and battery) almost 4 years old. I checked with a multimeter and the battery was holding 12.5 volts or so (engine off). The car cranks and starts fine.
Do I need to do anything about this preemptively? Add water? Or should I just wait until it starts dying more obviously. I'm pretty sure the battery is supposed to be considered maintenance free since it doesn't have individual caps on the cells.
IIRC the manufacturing date for the car was sometime in November of 2006 or so, making the car (and battery) almost 4 years old. I checked with a multimeter and the battery was holding 12.5 volts or so (engine off). The car cranks and starts fine.
Do I need to do anything about this preemptively? Add water? Or should I just wait until it starts dying more obviously. I'm pretty sure the battery is supposed to be considered maintenance free since it doesn't have individual caps on the cells.