TT Quattro Coupe V6-3.2L (BHE) (2005)
Battery: Procedures
Totally Discharged Batteries, Charging
Totally Discharged Batteries, Charging
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Batteries which have not been used for lengthy periods, e.g. in vehicles which have not been driven, are subject to self-discharge.
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Batteries are considered to be severely discharged if open-circuit voltage drops below 11.6 V. With voltage between 12.2 and 11.6 V, the battery
is pre-damaged. Measure no-load voltage:
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Vehicles without Energy Management Control Module J644.
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Vehicles with Energy Management Control Module J644.
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With severely discharged batteries, the electrolyte (mixture of sulfuric acid and water) is mostly water, with a greatly reduced sulfuric acid content.
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Severely discharged batteries become sulfated, i.e. all the plate surfaces of such batteries become hardened. Instead of being transparent, the
electrolyte has a slightly milky appearance.
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The sulfating process may be reversed if a severely discharged battery is recharged immediately.
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If battery is not recharged, plates will continue to harden, and ability to accept a charge will diminish. This results in reduction of battery
performance.
CAUTION:
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Risk of injury from battery acid.
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Prior to handling or servicing batteries, read, understand and observe the Warnings and Safety Measures for lead-acid batteries for
lead-acid batteries.
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Wear protective eyewear and clothing.
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On non-maintenance-free batteries, the sealing plugs must be installed tightly.
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Provide sufficient ventilation.
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If the magic eye has no color or is light yellow, the battery may not be tested or charged. Jump starting must not be used.There is a
risk of explosion during testing, charging or jump starting. The battery must be replaced.
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DO NOT battery test batteries which are gassing. Otherwise there is a risk of explosion.
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Rapid-charging batteries.
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Dispose of electrolyte (sulfuric acid/water mixture) properly.Waste electrolyte must only be disposed of in appropriate waste disposal
sites. Refer to local regulations pertaining to electrolyte disposal.
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The following notes and procedures must be followed to ensure correct charging.
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Risk of severely discharged batteries freezing.
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Severely discharged batteries freeze at low temperatures, the housing can crack.
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Batteries that have frozen must no longer be used.
Prerequisite
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Battery temperature must be at least +10 degrees C.
Procedure
Severely discharged (sulfated) batteries must be charged using a low charging current:
NOTE:
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The Midtronics Diagnostic Conductance Charging Station INC-940 automatically detects severely discharged batteries and carefully starts the
charging procedure with a low charging current. The charge current is automatically adjusted to the battery charge state.
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In order to initiate charging procedure, battery voltage must be at least 0.6 V.
CAUTION:
Risk of damaging severely discharged batteries.
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Do not quick charge severely discharged batteries.
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Charge battery.
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The charging voltage may be a maximum of 14.4 V.
NOTE: If battery is replaced, follow disposal regulations.