I have been in the club since 2007 as an LS430 owner but I am pleased to say I can add the SC model to my membership.I had the same issues with the battery on the LS as the car wasn't used on a regular basis and now experienced the same problem on the SC for the same reasons.So having solved the problem on the LS it has been a repeat performance on SC.Firstly one has to except that the sofisticated electronic systems on these cars do drain a battery and irregular use and insuffient journey lenghths do eventually take a premature toll on the life of the battery.To overcome this I invested in a much uprated Bosch battery to which one has to adapt slightly to fit and also at the time fitting a permanent connector on the terminals so it is simple just to plug a CTEK model 10 trickle charger on when you know the car wont be used for a while.
Just to mention on another subject on the SC.At first I was a little dissapointed with the harsh ride on less than good road surfaces and the vagueness of the steering of the SC.Now I had suspected the Dunlop Sport tyres,they are not run-flats,as the cause of this.After only 4 months of ownership I have had to replace the full set due to deep cracks between the treads which in my opinion was a safety issue.I mention this for anybody who might be considering a complete tyre replacement.All 4 tyres are now Michelin Premium HP filled with nitrogen[low cost option].I know tyres are a much debated subject but these Michelins have transformed my SC.It has made the steering more direct and poor road surfaces are far less abrupt and after an initial settling-in period of a couple hundred miles they run quieter than the Dunlops.
I look forward to now being SC section member.