S4 Quattro Wagon V8-4.2L (BHF) (2008)
performance.
Procedure for Charging Heavily Discharged Batteries
Heavily discharged batteries, which have become sulfated, must be charged as follows using a low charging current:
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Adjust charging current to approx. 5% of the battery capacity, i.e. for a 60 Ah battery the charging current is approx. 3 A (ampere).
Charging battery => [ Battery, Charging ].
The charge voltage (Umax) may only amount to a max. of 14.4 V (volt).
Severely discharged batteries should never be charged quickly.