5 years on a battery is about the expected life.

Keep it charged and replace it when symptoms of a weak battery (low voltage, slow cranking) occur.

Forget the indicator. I've had batteries go 4 or 5 years after the indicator shows "bad" and I've had bad batteries with a "good" indicator.

Most indicators merely reflect cell fluid level or acidity not whether there is adequate voltage or continuity between the cells.

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“Whatever story you're telling, it will be more interesting if, at the end you add, "and then everything burst into flames.”
― Brian P. Cleary, You Oughta Know By Now