Should the dot on my car battery be green?
category: QA
Question by syllinx: Should the dot on my car battery be green?
My car won’t start and i thought the dot on the maintenance free battery was green before. Any help would be nice.
Best answer:
Answer by Eric F
that green dot is very misleading.
Fact: the green dot ONLY monitors 1 of the 6 cells.
it’s actually there for the sole purpose of determing if the battery has a charge after it left the manufacturer.
And yes, they aren’t always accurate.
I’ve shaken batteries up and the black dot turned green. Please ignore that.
The average life of a battery, and yours is an AC Delco I believe, is 4-5 years max. anything more, you’re lucky.
try having your car jump started if the car starts, the battery is probably weak.
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green means that that particular cell has a good charge, black means that that cell has a low charge, and white means that the electrolyte is low. he is correct though, that eye is only showing the state of charge in one cell, but normally that is good enough.
If by won’t start you mean the engine won’t crank or cranks slowly, a low battery could definitely cause that, and if the eye is not green, that is an indication of a low battery. Charge the battery if you still have a problem have the battery load tested. If the eye on the battery is clear it is low on electrolyte and cannot be refilled replace the battery