S4 Quattro Wagon V8-4.2L (BHF) (2008)
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Connect positive battery charger clamp - 3 -to positive ( + ) terminal - 4 - and to negative battery charger clamp - 5 - to negative terminal- 1 -
(VAS 5900 charger shown for illustration purposes only).
All:
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Switch on battery charger.
CAUTION!
If battery begins gassing (boiling) violently when charging, REDUCE charging rate immediately.
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Adjust charging rate according to battery capacity (refer to Midtronics INC-940 Instruction Manual).
Charging totally discharged batteries
‹› Batteries which have not been used for lengthy periods, e.g. in vehicles which have not been driven, are subject to self-discharge.
‹› A battery is considered to be totally discharged if the no-load voltage has dropped below 11.6 V. Initial battery damage can occur between 12.2
and 11.6 V. Measuring no-load voltage => [ Battery No-Load Voltage, Checking ] See: Testing and Inspection/Component Tests and General
Diagnostics/Battery No-Load Voltage, Checking.
‹› In a totally discharged battery the electrolyte (sulfuric acid/water mixture) is reduced to almost all water, as the sulfuric acid content is heavily
reduced. At temperatures below zero, the battery may freeze and the cause the housing to burst.
‹› Totally discharged batteries become sulfated, i.e. all the plate surfaces of such batteries become hard. The electrolyte has a slightly milky
appearance (instead of being clear).
‹› If totally discharged batteries are charged directly after being discharged, the sulfation dissipates.
‹› If this is not done, the plates become even harder and their ability to absorb charge is impaired. This results in reduced power output.
Procedure for charging exhausted batteries (sulfated)
Totally discharged batteries (that are also sulfated) must be charged as follows using a low charging current:
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Set charging current to approx. 5 % of battery capacity, i.e. for a 60 Ah battery the charging current is approx. 3 A.
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Charging battery => [ Battery, Charging ] See: .
