Since I have very limited knowledge I am asking here. As far as I know, power supplies like the one pictured above only put out what is requested by the electronic device (not an all or nothing type of deal). I could be wrong so I figured I would ask.
As for leaving the battery in, I dont think that would be a good idea. Again I am not very knowledgeable with these components but I can see 2 potential issues. I would think if it charged the battery it would overcharge it as the supply would not have a charging circuit. The other is unknown why to me but seen from experience. If my 12 volt power supply for my lights touches a car battery it shuts off. It is kicking some type of circuit protection. Not sure if it sees it as an overload or short circuit but its instant off. Makes me think similar would happen with what I am trying to do here but could damage components in the process.
Thanks for the replies so far...