Low battery/starting failure

What is your question?

I have a 2000 Accura TL V6 now at repair shop for 3rd time. Has new battery. Alternator/charging system checked, Satarter and system checked. No problem are parts have been replaced but battery still goes down, especially when driveing with a/c on or in stop & go conditions, short trips , etc. Will jump start easy. This is a year long problem. I would appreciate your input.