I went out to the storage area to try to install a TV behind the doors in the bedroom of our Bullet 247BHSWE. Sadly that didn't work out (TV is about .3 inches too thick at 1.9 inches with a .6 inch m...
Parasitic drains will completely drain a RV battery in a couple of weeks. Like the above poster suggested either discount the battery or install a battery cutoff when not in use or not plugged in.
Not just the radio, you have refrigerator circuit board, gas detector and possible other draws to discharge the battery.