With one of my previous cars I didn't drive it often so found the battery almost dead when I wanted to use it. I ended up buying a solar trickle charger and it seemed to help. They usually plug into the cigarette lighter but some come with clamps to attach directly to the battery. Of course this wouldn't work so well if you keep the car garaged!
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Cars...
'93 Audi Coupe 2.0 Alpine White (sold)
'99 Audi S4 Merlin Purple - K04 upgrade to 412hp (sold)
'00 Audi S8 Agate Grey (Sold  )
'11 Audi Q7 4.2tdi Unknown Red (Classic Red Pearl Effect - thanks MJ)
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