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At the first sign that the battery is weak or not holding a full charge. Batteries can last from 2 to 7 years. You never know when it will fail. You can test it with a DC volt meter.

12.6 volts = 100% charge

12.4 volts = 75%

12.2 volts = 50%

12.0 volts = 25%

If it is not holding a 100% charge then it may need replacing.

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13y ago
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