There is no doubt CTEK does good battery charges if a bit expensive but the one linked is only 5A. They do 25A workshop chargers but they are £200+.
I would recommend at least 10A for A8 http://www.ctek.com/gb/en/chargers/MXS%2010
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Currently 8less
2011 Q7 S Line 3.0TDI, 2016 Tesla Model S 90D
8 history:
2006 A8 Sport 4.2TDI quattro SOLD,
1997 S8, reached end of life with gearbox failure
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