Minimum 1000 cca for starting battery. Personally, when my originals go out i have now gone back to the 27MXHD Interstate batteries. I used them for years with good luck, then they had a weak spell with another mfg. making the batteries, and now i believe they are made again by Johnson Controls(good) and ive gone back. Them or Die Hards(same mfg.?) have served me well. Trojans are no bueno, and Continentals not any better ! The AGM batteries ? dont know,,,,D.