green light on charger red light on battery

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My mower battery charger is showing with the 4 green bars to indicate that it is fully charged but the light on the battery is red. The unusual thing is that when I put the battery in the mower the light shows green on both the mower and the battery. It mows the grass fine, it is a small lawn.

The battery and charger is 4 years old. I try to remember to put it on the charger occasionally in the winter so it doesn't deep discharge. I keep the battery inside the air conditioned house.

 I'm wondering if I may have a bad charger or a cell in the battery is failed. Has anyone else seen this?
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Posted 4 weeks ago

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szwoopp, Champion

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Official Response
You will have to give customer service a call - they can help you diagnose the problem and possibly provide a solution.