I took my car in a couple of weeks ago because of a slight hesitation on acceleration and it was resolved but I was kind of surprised with a lecture and printout about my battery being weak even though I didn't mention anything about the battery. I just found out why. PCNA released a 13 page TSB about batteries in 997s. There must be a lot of battery issues.

http://www.alldata.com/tsb/Porsche/1...-06/index.html