Battery help.. question for the battery experts

thanks everyone, im assuming that a 1.5 amp charger will not fully charge a deep cycle battery that's drained, but will keep it charged if its already 75% or more charged? I ask because I have a 1.5 amp charger that I use to charge my snowmobile batterys. and want to just use that for the winter for keeping my rv batterys charged in my basement as its needed. during summer months I just use the converter on the camper to charge..thanks