The title sums it up.
The car is my friend's 2007 Ford Fusion 3.0 AWD.
I charged the battery and load-tested it with an old-school resistive tester - the analog scale shows the battery still having good reserve.
I checked dark current several times, and it's consistently under 30 mA, which I consider acceptable.
If the car sits for several days, the engine won't turn over - the solenoid rattles, but that's it.
There's a sticker on the battery shown a manufacturing date of 2018 03. The battery is 6-1/2 years old, and may have been in the car almost as long.
Would it reasonable to replace the battery even though it tests as good?
Another possibility is a weak starter motor that needs the battery to be fully charged to work. (I went through this with one of my own vehicles a few years ago.)
The car is my friend's 2007 Ford Fusion 3.0 AWD.
I charged the battery and load-tested it with an old-school resistive tester - the analog scale shows the battery still having good reserve.
I checked dark current several times, and it's consistently under 30 mA, which I consider acceptable.
If the car sits for several days, the engine won't turn over - the solenoid rattles, but that's it.
There's a sticker on the battery shown a manufacturing date of 2018 03. The battery is 6-1/2 years old, and may have been in the car almost as long.
Would it reasonable to replace the battery even though it tests as good?
Another possibility is a weak starter motor that needs the battery to be fully charged to work. (I went through this with one of my own vehicles a few years ago.)