I should add, When I did it I basically used the battery as the PRIMARY source and floated it on a charger. As I said it worked, However I found the battery did not last as long as I had expected (And those big blocks of lead are expensive)
Today, thanks to the research I did into my RV.. I know why. A single voltage charger can not properly maintain a battery
One option might be to set the power supply at the FLOAT voltage of the battery (Allowing for the blocking diode of course) and use a "Battery Minder" (Around 20-100 dollars) to provide the absorption charge on the battery... I think this should work so long as the radio is not turned on 24 x 7
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