S4 V8-4.2L (BHF) (2004)
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Disconnect negative (-) terminal - arrow - from battery post.
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Measure voltage between battery posts.
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Battery is OK if measuring instrument reading is 12.5 V or above.
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The battery no-load voltage must at no time be less than 12.5 Volts, otherwise the battery must be recharged immediately.
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Repeat voltage measurement between terminals.
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Battery no-load voltage must not be less than 12.5 Volts.
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If no-load voltage is not OK, replace battery.
Install in reverse order of removal, noting the following:
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Reconnect battery. Required steps.