Whoopsy, as others have mentioned, I think there is something consuming electricity at rest in your car. Battery complaint is actually extremely un-usual in Porsche 997 forums.

BTW, no direct experience, nor advocating, but this is what I found in the past ($77 vs. $450 (??) for the Porsche battery).

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http://www.6speedonline.com/forums/997-turbo-gt2/220185-battery-recommendation.html

Special thanks to JasonKM (rennlist) for making this easy. As per his advice, I installed Walmart's EverStart MAXX 94R. It fits absolutely perfectly! It's almost identical to OEM battery except this carries 765 CCA and 3 yr direct replacement + 9 yr pro rate. I paid $77 + core charge which seems like a bargain compare to OEM. This battery was made by Johnson Controls.


 


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Regards,
Can
997 Turbo + Bilstein Damptronic "Stage 2" ( Review ) + GIAC ECU Custom Tune ( Fast as a torpedo & reversible to stock - Review ) + Cargraphic Exhaust ( Oh heavenly noise! )