The Stanley 40amper looks to be the earlier version of the B&D Vector with just the Recondition (pulse desulphation) but not the Equalize (high voltage desulphation/equalize) However it does add the feature of dropping to a Float more like a converter.
http://www.boatandrvaccessories.com/stanley-bc4009-40-amp-12-volt-battery-charger.htmlStanley bought B&D after it had bought Vector.
You could need a number of chargers for different aspects of the job. A 40amper for fast charging, a Tender for Floating, and a manual charger for the high voltage equalizing.
