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Audi A5 f5 3.0 TDI Quattro S line S tronic Virtual Cockpit Driving assist pack
977 Posts
Personally I had a standard OEM battery and added additional subwoofer, the car lights would dim from time to time when the subwoofer drew too much battery, replaced with Bosch S series battery and Never happens again. Can honestly say, solid batteries from a standard oem.

never had Varta so can’t chime in there.

also to consider the Warranties! Bosch has a 3yr national regardless of which Bosch S series, where as Varta is slightly more adhering, see photos!

Hope this helps!
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