As an aside, shop ebay for the intellipower units. IMHO using a float charger will be wasted time and money if replacing the Univolt is in your plans. With care, you can use the Univolt until you are ready to upgrade. The problems with boiling the battery are long term as a rule: Months plugged in. The intellipower install is easy: unplug the Univolt and disconnect the 12V
connections from the fuse block. Undo whatever is holding the Univolt to the floor and remove it. Put the intellipower unit in and put a couple of screws through the feet into the floor. Connect the 12V
to the fuse block, plug the 120V plug into the receptacle and you are done. The worst part is lying on the floor, reaching into the cabinet.