Max the old auto shop teacher agrees, unless you do not observe correct polarity, using a larger battery than normal won't hurt anything as long as the voltage is =. We've used D-8 group batteries( think CAT engines some were 1800 CCA, our Savage battery is about 160 and the AGM are rated at 190 CCA) for years on a hand truck to jump start vehicles below 0 in the instructional parking area. Once they came up with those nifty booster pacs, life in the winter was much easier. No 12 V to 6V systems or 24 V trucks or equipment to 12 V stuff. An be cautious around pre 55 Domestic cars with positive ground and English cars for a few years after that. Max