With your BCDC1225. I went the 40 amp bcdc. Havent had any problems with exceeding C/10 in the n70 size typically being 100 AHs or so. C/10 is an old wives tale sacred cow from old skool tranformer based dumb chargers. What matters is not overcharging and the multi stage algorithms in red arc wont ever over charge. Plus a patrol alternator can feed 80 amps if the battery will drink it and thats still half what Ive fed mine. The main thing is not doing something thats overcharging or overheating the battery, like AGMs dont like engine bay heat.