We do not have a different charge controller. We are presently using the AGM battery
settings on our Mastervolt Combi which charged the batteries and is now in float mode with no charge current
being applied. I checked the Balmar regulator
on the same AGM
settings and it seemed to work OK as well. We also have BlueSky solar
charge controllers and I have not yet adjusted the voltages. I have heard that lithium batteries can take higher charge voltages (14.8V) than our AGM settings but time will tell. Some fine tuning of these parameters is probably in order but it seems to be acceptable "out of the box".
The most noticable difference is that the charger
work flat out with these batteries as they have a very high charge acceptance rate of three times capacity or 640 X 3 = 1,920A, more than ten times what our alternator