Ok I have a pretty high end amp and speakers on my wing. I can't turn on the accessory switch and run the stereo without running my battery down in short order (I have an 800 W amp in the trunk). I was thinking of running a second battery in the trunk of the wing and running the stereo from the second trunk battery. I am adding a switch in the trunk to connect the main battery to the secondary battery. Basically the second battery is used only at stops when I am posted up with the fella's to listen to the stereo. In motion I switch to both batteries so that they both are getting charged by the alternator. Has anyone done this and are there some possible pitfalls with the main battery or electronics on a wing that I may run into.