Dan - Thanks for your understanding of it, and the link. This is exactly what I was looking for.
It sounds like many of the chargers that rely on current measurements can be fooled by the load. I am guessing the Xantrex 5A model I have may have this issue.
It sounds like I may want to get a...
I just bought a XPower 1500 (by Xantrex). This unit contains a 60AH AGM lead acid battery and a built in 1350Watt Inverter. It is a portable and quiet generator based on batteries. It comes with an External 'float' type smart charger.
So you are supposed to charge this guy up, and then use it...