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My Optima is 4+ years old and currently have a strange issue.
After a drive I normally plug in the Battery Tender and within an hour or so it goes from the beginning red light , thru the flashing green to the steady green.
Recently the light has been staying at red.
I disconnected the neg cable to rule out something in the car discharging the battery.
The current battery voltage is 13.8v.
Ive tried 2 different Battery Tenders and both behave the same.
What does this indicate? Battery not charging so its bad?
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