If you start off with absolutely full batteries, connect the maintainer and find the voltage less than nameplate spec (but be sure to adjust for temperature compensation if the maintainer has that feature!), then the maintainer is not large enough. If a single 800 ma rate kept my group 29 battery up to spec, then why wouldn't 1600 ma, 1.6 amperes, keep 230 amperes hours worth of battery up to spec? I have never seen a flooded battery maintained at 13.2 volts overcharge in 100F weather nor have I seen the same battery floated at 0F overcharge at 14.4 volts float. Unless you live where a Chinook can happen, temp compensation is not nearly as big a deal floating a battery as it is charging a battery. I simply would not store a battery where it gets to -40F nor to 110F. I prefer glancing at things once a week or so.